The Correct Order to Detail a Car

Why the Order You Detail a Car Matters

There is more to detailing a car than working through a collection of cleaning products.

The order matters.

Certain processes prepare the surface for the next one. If those stages are performed in the wrong sequence, you can create unnecessary work, reduce the performance of products or, in some cases, introduce defects that you then need to correct.

You would not clay heavily contaminated paint before washing it.

You would not apply a ceramic coating and then machine polish the paint.

You would not polish a panel and then cover it in fallout remover.

And there is little point cleaning your glass perfectly before spending several hours polishing, protecting and cleaning the interior around it.

A proper detailing process therefore follows a logical progression:

1. Wheels, tyres and wheel arches

2. Pre-wash

3. Contact wash

4. Chemical decontamination

5. Mechanical decontamination, if required

6. Final wash, rinse and drying

7. Paint inspection and polishing, if required

8. Surface preparation

9. Protection

10. Interior detailing

11. Tyre and exterior trim finishing

12. Glass

13. Final inspection

This basic progression is reflected across UK detailing manufacturers. Auto Finesse's detailed process starts with wheels, progresses through pre-cleaning, contact washing and decontamination, then moves into polishing, protection and final finishing. Bilt Hamber gives a similar product order of wheel cleaning, pre-wash, shampoo, fallout removal, clay, paint preparation and wax. Infinity Wax categorises its own detailing system in almost exactly the same progression: wheels, pre-wash, contact wash, decontamination, drying, polishing, protection, tyre and trim care, glass and interior care.

That does not mean every detail must contain every stage.

A maintenance wash will normally stop long before clay, polishing or ceramic coating.

The full process is used when the condition of the vehicle actually requires it.

Before You Start

Before reaching for any chemical, assess the vehicle.

Look at:

• how dirty it is

• the wheel finish

• existing wax, sealant or ceramic protection

• tar deposits

• visible iron contamination

• water spotting

• paint defects

• sensitive trim

• PPF or vinyl

• matte or satin surfaces

• previous paint repairs

• interior condition

You are then choosing the processes required for that particular vehicle rather than blindly performing every detailing stage.

Where possible, work on cool surfaces and out of direct sunlight. Autoglym specifically recommends cool surfaces because heat accelerates evaporation and can cause cleaning products to dry before they can be properly rinsed. Bilt Hamber similarly instructs users of Touch-Less to work on cool panels in shaded conditions and never allow the product to dry.

Stage 1: Wheels, Tyres and Wheel Arches

For most full exterior details, start with the wheels.

There is a practical reason for this.

Wheels are normally among the dirtiest areas of the vehicle. Cleaning them can release brake dust, road grime and wheel-cleaning chemicals onto surrounding panels.

If you clean the paint first and then attack heavily contaminated wheels, you risk covering your freshly washed bodywork in dirty wheel-water.

Autoglym explicitly recommends cleaning wheels before bodywork for this reason. Auto Finesse also starts its full detailing processes with the wheels.

Clean the tyre now, dress it later

This distinction is important.

During the wheel-cleaning stage, you clean:

• wheel faces

• wheel barrels

• spokes

• wheel nuts or bolts

• brake-accessible areas where appropriate

• tyres

• wheel arches

The tyre dressing does not go on yet.

Tyre dressing is a finishing product and should be applied to properly cleaned, dry rubber near the end of the detail. Infinity Wax specifically notes that applying dressing to dirty tyres reduces durability and can contribute to sling.

Why use separate wheel equipment?

Wheels accumulate brake material, road grit and heavily concentrated contamination.

Keep wheel brushes, tyre brushes and wheel wash media separate from equipment that will later touch the paintwork.

Auto Finesse's current wheel guidance similarly recommends separate tools for wheel faces and tyres because their surfaces and cleaning requirements differ.

Does every wheel need strong wheel cleaner every time?

No.

This is a good example of where detailing should be condition-led.

Bilt Hamber states that its reactive Auto-Wheel cleaner is not necessary during every wash and that regularly maintained wheels may simply be washed using car shampoo until contamination has built up sufficiently to justify stronger chemical cleaning.

Use the least aggressive process that achieves the required result.

Stage 2: Pre-Wash

With the wheels completed, move onto the bodywork.

Before a wash mitt touches the vehicle, use a suitable pre-wash.

The purpose of pre-washing is to break down and remove as much contamination as reasonably possible without physical contact.

Infinity Wax describes pre-wash as a crucial stage because it breaks down dirt and contamination before contact with the vehicle. Auto Finesse places pre-cleaning and snow foam before its contact wash for the same reason.

A pre-wash could include:

• citrus pre-wash

• alkaline pre-wash

• traffic film remover

• snow foam

• other dedicated automotive pre-cleaners

Snow foam is therefore part of the pre-wash family rather than an entirely separate detailing process.

Why Pre-Wash Comes Before Contact Washing

Imagine the vehicle is covered with:

• road grit

• traffic film

• winter salt

• mud

• fine mineral contamination

• insect remains

If you immediately introduce a wash mitt, some of that material can become trapped between the mitt and the paint.

The objective is therefore to remove as much of it as possible first.

Auto Finesse describes the wash stage as particularly important for reducing the risk of dragging particles across paint during later processes.

The basic principle is:

chemistry and water first, physical contact second.

Pre-Rinse or Pre-Wash First?

There is no universal rule.

Some detailing products are designed to be applied directly to a dry dirty vehicle.

Others may be used after an initial rinse.

A heavily mud-covered vehicle may benefit from having obvious loose material pressure-rinsed away before the chemical stage.

Product instructions take priority.

This is one of the reasons the phrase "always apply snow foam to a dry car" should not be treated as an industry rule.

Do You Need Both Pre-Wash and Snow Foam?

Not necessarily.

A liquid pre-wash applied using a pump sprayer can perform the pre-cleaning job perfectly well.

Snow foam provides a convenient way of distributing suitable chemicals and increasing dwell on vertical surfaces.

Some professional workflows use both a liquid pre-cleaner followed by snow foam.

Others use one effective pre-wash product.

The important requirement is not how many pre-wash stages you perform.

It is how much contamination you safely remove before contact washing.

Stage 3: Pressure Rinse

After the chosen pre-wash has been given the correct dwell time, rinse the vehicle thoroughly.

Do not simply aim to remove the visible foam.

The objective is to flush away the contamination that the chemical has loosened.

Pay particular attention to:

• lower doors

• sills

• side skirts

• rear bumper

• tailgate

• front bumper

• grilles

• behind wheel arches

• badges

• window surrounds

The lower sections generally contain the heaviest traffic film.

Bilt Hamber instructs users to allow Touch-Less to work for between one and five minutes before pressure rinsing, while warning that the product must not be allowed to dry. This is a useful reminder that dwell times are product-specific rather than universal.

Stage 4: Contact Wash

Once loose and pre-wash-removable contamination has been removed, move onto the contact wash.

This is where automotive shampoo and wash media physically clean the remaining film from the vehicle.

For a conventional bucket wash, a common method is:

Bucket one: shampoo solution.

Bucket two: clean rinse water.

The wash mitt is rinsed in the clean-water bucket before being returned to the shampoo solution.

Autoglym currently recommends this two-bucket approach and advises working from the top of the vehicle downwards because the lower areas tend to contain more dirt.

Multi-mitt washing is another legitimate contamination-control technique.

The underlying principle is the same:

do not continually put heavily contaminated wash media back onto clean paintwork.

Wash From the Top Down

Begin with cleaner upper surfaces and leave the most contaminated lower sections until later.

A sensible order is:

• roof

• glass

• bonnet

• upper boot or tailgate

• upper doors and wings

• middle sections

• bumpers

• lower doors

• sills and side skirts

Use minimal pressure.

If a contaminant refuses to move during a normal contact wash, the answer is not automatically to scrub harder.

It may require specialist chemistry during the decontamination stage.

Stage 5: Chemical Decontamination

This is where a full detail begins to differ significantly from an ordinary maintenance wash.

After washing, contaminants can remain chemically or physically bonded to the vehicle.

These can include:

• ferrous contamination

• industrial fallout

• brake-derived metallic particles

• road tar

• adhesive

• tree sap

• stubborn mineral deposits

Normal shampoo is not designed to remove all of these contamination types.

Decontamination products are therefore used after the normal dirt has already been removed.

Auto Finesse explicitly states that the car should be washed before decontamination because the decontamination stages are intended to address contamination that a normal wash cannot.

Chemical Decontamination Before Clay

Where possible, remove contamination chemically before reaching for mechanical clay.

This reduces the amount of contamination the clay media has to physically pull from the paint.

We recommend treating paint with iron remover before Clay specifically so the clay has less embedded metallic contamination to deal with.

That is a much more useful rule than treating clay as the first decontamination product.

Iron and Fallout Removal

A fallout remover or iron remover targets ferrous contamination.

It is often associated with the familiar colour-changing reaction seen with many modern reactive cleaners.

Ferrous contamination can accumulate on both paint and wheels, and products such as Bilt Hamber Korrosol and Auto Finesse Iron Out are specifically designed to remove this contamination before further surface preparation.

Do not assume every fallout remover has identical chemistry.

The product instructions matter more than whether the liquid turns purple.

Tar and Glue Removal

Tar remover deals with a different contamination type.

It is formulated to dissolve or soften:

• tar

• bitumen

• adhesive

• certain sticky road residues

Infinity Wax describes its Liquefy Tar & Glue Remover as a solvent-based product intended for decontaminating painted surfaces before polishing or waxing.

The reason for removing tar before clay is straightforward.

If a chemical can dissolve stubborn contamination without physically dragging it across the paint, there is little sense making the clay do that work instead.

Should Fallout Remover or Tar Remover Come First?

This is one of those detailing questions where the internet often presents opinion as a fixed rule.

There is no universal chemical law saying every brand's iron remover must always be used before every brand's tar remover.

Auto Finesse's current decontamination process uses:

1. fallout remover

2. tar and glue remover

3. clay

and specifically warns that solvent residue should be removed before clay because solvent can interfere with traditional clay media.

Other manufacturers formulate their own systems differently.

The more important rules are:

normal washing first

chemical decontamination before unnecessary mechanical decontamination

remove product residues properly between incompatible stages

follow the instructions for the chemicals being used

Stage 6: Mechanical Decontamination

After chemical decontamination, assess the paint again.

If it still feels contaminated, you may need detailing clay.

Mechanical decontamination can use:

• traditional clay bar

• synthetic clay mitt

• clay towel

• clay pad

Clay removes remaining bonded contamination by physically interacting with the surface.

It must be properly lubricated.

Bilt Hamber explicitly states that its Auto-Clay must never be used dry and recommends keeping the surface thoroughly wet throughout use.

Do You Need to Clay Every Car?

No.

If chemical decontamination has left the paint smooth and clean, there may be no reason to clay it.

Clay can create light marring, particularly on softer paint systems.

That is why mechanical decontamination is especially appropriate before machine polishing, where any minor clay-induced marring can subsequently be refined.

Do not turn clay into a mandatory maintenance-wash stage.

It is a tool used when the surface requires it.

Wash Again After Decontamination?

Often, yes.

A decontamination process may leave:

• chemical residues

• dissolved contamination

• clay lubricant

• tar-remover residue

Auto Finesse recommends washing or thoroughly cleaning the treated surface between solvent tar removal and traditional clay, then washing and rinsing again after claying. Bilt Hamber's detailing-kit process similarly includes another wash after clay before moving into paint preparation.

This gives the polishing stage a genuinely clean surface to work on.

Stage 7: Dry the Vehicle

Before polishing, the vehicle needs to be properly dried.

This includes trapped water around:

• mirrors

• badges

• grilles

• window seals

• door handles

• fuel filler areas

• panel gaps

• lighting

• number plates

A dedicated car dryer is particularly useful before machine polishing because water trapped in panel gaps has an irritating habit of appearing again when the machine vibrates the panel.

A quality microfibre drying towel remains perfectly suitable for normal surface drying.

Auto Finesse's full detailing process similarly places drying after decontamination and before polishing.

Stage 8: Inspect the Paint

The car may now be extremely clean.

That does not mean the paint is defect-free.

Under suitable lighting you may find:

• swirl marks

• wash marring

• oxidation

• light scratches

• haze

• holograms

• water-spot etching

• sanding marks

• previous polishing defects

This is the point where you decide whether polishing is required.

Stage 9: Polishing

Polishing comes after washing and decontamination because the polishing pad needs to work on paint, not dirt and bonded contamination.

Auto Finesse describes effective deep cleaning as part of preparing a vehicle for safe paint correction, while Autoglym specifies that its Advanced Paint Restorer should be used on a clean, contaminant-free surface.

Polishing may be performed:

• by hand

• with a dual action machine polisher

• with a forced-rotation machine

• with a rotary polisher

depending on the objective and the experience of the operator.

Paint Enhancement vs Paint Correction

These terms are often used loosely.

In professional UK detailing, paint enhancement normally describes polishing primarily intended to improve gloss, clarity and lighter defects.

Paint correction generally refers to more deliberate abrasive defect removal.

Neither term defines an exact percentage of defect removal.

One company's "single-stage enhancement" may be more aggressive than another company's.

The actual process, abrasive combination and result matter more than the marketing label.

Always Use a Test Spot

Before machine polishing an entire vehicle, test a representative area.

The purpose is to determine:

• how hard or soft the paint behaves

• what level of cut is required

• whether the selected pad and compound finish cleanly

• whether a refining stage is necessary

The goal should be obtaining the required result without using unnecessary aggression.

A machine polisher should never simply be fitted with the strongest pad and compound available because the paint has visible swirl marks.

Does Every Detail Need Polishing?

No.

Polishing is an abrasive process.

If the vehicle does not require defect removal or surface refinement, there is no reason to abrade the paint simply because you have reached the "polishing stage" of a checklist.

A maintenance detail may go directly from washing and drying to protection.

A protection detail may require decontamination without significant polishing.

A correction detail may require extensive machine polishing.

The condition and objective dictate the process.

Stage 10: Surface Preparation After Polishing

After machine polishing there can be:

• polishing oils

• lubricant

• compound residue

• dust

• fillers, depending on the polish

Some protection products, particularly ceramic coatings, require these residues to be removed before application.

This is where a panel wipe or dedicated surface-preparation product is used.

Gtechniq describes Panel Wipe as a solvent-based preparation product designed to remove polishing oils and residues before ceramic coatings or sealants, leaving the surface ready for bonding.

Does Every Wax Need a Panel Wipe?

No.

Do not automatically panel-wipe every polished vehicle.

Some polishing and protection systems are designed to work together.

Bilt Hamber, for example, recommends Cleanser-Fluid as a preparation product specifically designed to clean and prime paint for wax durability, while its Cleanser-Polish can be overcoated with the company's waxes after the recommended interval.

If you are fitting a ceramic coating that requires a completely residue-free surface, use the coating manufacturer's preparation process.

If you are using a glaze, cleaner polish, wax or sealant system designed to work together, follow that system instead.

Again, product compatibility beats generic rules.

Stage 11: Protection

Once the paint is properly prepared, protection can be applied.

Options include:

• traditional wax

• synthetic sealant

• spray sealant

• ceramic sealant

• ceramic coating

These are different product categories and should not be treated as interchangeable simply because they all make water bead.

The correct protection depends on:

• desired durability

• paint condition

• preparation performed

• vehicle usage

• maintenance routine

• application environment

• experience

Why Protection Comes After Polishing

This one should be obvious once the processes are understood.

Machine polishing is designed to abrade and refine the upper surface.

If you apply wax or sealant before polishing, the polishing process will simply remove it.

Protection therefore comes after the correction or enhancement work is complete.

Auto Finesse's detailing workflow follows exactly this sequence, moving from polishing into glaze where required and then wax or sealant.

Ceramic Coatings Need More Preparation

A ceramic coating is particularly dependent on surface preparation.

The coating manufacturer may specify:

• thorough washing

• decontamination

• polishing where necessary

• panel wipe

• temperature limits

• indoor application

• cure time

• top-coat timing

Gtechniq specifically describes Panel Wipe as the preparation stage used to remove polishing residue before its coatings and notes that this is required to maximise coating bonding.

Do not treat a professional-grade coating like a spray wax.

Follow its application instructions precisely.

What About Wheel Protection?

If you are carrying out a full detail, wheel protection can also be applied once the wheel is properly cleaned and decontaminated.

Depending on the product, that may happen earlier in the overall process or during the protection stage.

The important requirement is that the wheel surface has been prepared according to the protection manufacturer's instructions.

The same applies to specialist:

• glass coatings

• trim coatings

• fabric protection

• leather protection

Each surface has its own preparation requirements.

Stage 12: Interior Detailing

The interior is slightly different because it is largely independent of the paintwork process.

That means there is no universal rule saying the interior must be completed at one exact point during every detail.

Professional detailers may clean the interior:

• while paint protection is curing

• before exterior finishing

• after the wet exterior stages

• as a completely separate workflow

For a single-person full detail, completing the major exterior work first and then moving inside is a logical workflow.

Auto Finesse's own detailing guidance places interior cleaning after paint protection and before its final tyre and glass finishing stages.

The Correct Order for Cleaning an Interior

Inside the cabin, the same basic logic applies.

Remove loose contamination first, then clean surfaces.

A sensible sequence is:

1. Remove rubbish and personal items

2. Remove floor mats

3. Vacuum loose contamination

4. Deal with headlining where required

5. Clean dashboard and upper surfaces

6. Clean vents, switches and controls

7. Clean doors and door cards

8. Clean seats

9. Clean carpets and floor areas

10. Clean pedals and lower trim

11. Protect suitable surfaces where required

12. Clean interior glass

Auto Finesse recommends clearing the cabin first and generally works from the boot through the rear cabin to the front, completing areas methodically. Its interior guidance also recommends addressing upper areas such as the headlining before lower sections where required.

Vacuuming before wet cleaning prevents loose grit, crumbs and debris becoming mixed into cleaning products.

Be Careful With Interior Materials

A modern vehicle interior may contain:

• coated leather

• Alcantara

• suede

• fabric

• vinyl

• soft-touch plastic

• gloss black plastic

• touchscreens

• open-pore wood

• metal

• carbon fibre

• piano-black trim

Do not assume one aggressive APC is suitable for everything.

Use products appropriate for the material and spot-test uncertain surfaces.

Stage 13: Tyres and Exterior Trim

The tyres were cleaned at the very beginning.

Now they can be dressed.

This is a finishing stage, not a cleaning stage.

Auto Finesse positions tyre dressing as one of the final steps of a detail and describes it as the finishing treatment applied after tyre cleaning.

Apply the product evenly using a dedicated applicator.

Avoid excessive product.

A tyre dressing should remain on the tyre sidewall, not be sprayed over:

• wheel faces

• brake discs

• tread surfaces

• surrounding bodywork

Allow the product to settle according to its instructions before driving.

Exterior Trim

Unpainted exterior plastics and rubber trim can also be finished at this stage.

Depending on the product this may involve:

• temporary trim dressing

• trim sealant

• long-term trim coating

The trim should already be properly clean and dry.

Gtechniq, for example, specifies that C4 Permanent Trim Restorer should be applied only after dirt, oils and old dressings have been removed from the surface.

Cleaning and dressing are separate operations.

Stage 14: Glass

For a complete detail, glass is best left until very near the end.

Why?

Because during the rest of the detail you are likely to create:

• fingerprints

• polishing dust

• wax residue

• product overspray

• interior-cleaner mist

• smears

Auto Finesse specifically says it leaves glass until the final stage because fingerprints, dust and smears are likely to appear while working around the vehicle.

That is why I would slightly change any detailing sequence that places the final glass clean before interior work.

Clean Both Sides

Exterior glass and interior glass accumulate different contamination.

The exterior receives:

• road film

• insects

• mineral deposits

• weather contamination

The inside can accumulate:

• fingerprints

• plastic off-gassing residue

• smoke or vape residue

• interior dressing overspray

• dust and grease

Gtechniq specifically recommends cleaning both sides of the glass rather than assuming the visible streak is necessarily on the exterior.

A Useful Glass-Cleaning Trick

Use different wiping directions.

For example:

inside glass: final wipe horizontally.

outside glass: final wipe vertically.

If a streak remains, its direction immediately tells you which side of the glass needs attention.

Auto Finesse recommends this technique in its finishing guidance.

What About Glass Polish and Glass Coatings?

Normal glass cleaning and glass correction or protection are different processes.

If the glass has:

• mineral deposits

• embedded contamination

• wiper marks

• staining

it may require deeper preparation.

A glass coating also has its own preparation sequence.

Gtechniq, for example, recommends cleaning the glass, polishing it with its dedicated glass polish and carrying out a final clean before applying G5 water-repellent coating.

Follow the glass-product system rather than simply spraying coating over ordinary glass cleaner residue.

Stage 15: Final Inspection

A proper detail ends with inspection.

Walk around the vehicle under good lighting and look from different angles.

Check for:

• wax or sealant residue

• ceramic coating high spots

• polishing dust

• water trapped around mirrors

• tyre-dressing smears

• glass streaks

• missed wheel areas

• polish around badges

• product in panel gaps

• fingerprints

• missed interior areas

Auto Finesse's finishing guidance specifically recommends inspecting the vehicle after washing, drying or protection for water marks, smears, dust and missed areas before final sign-off.

Professional detailing is as much about quality control as it is about applying products.

The Complete Correct Detailing Order

For a comprehensive full detail, our recommended process is:

1. Inspect the vehicle

Identify surfaces, contamination and defects before deciding which processes are required.

2. Clean wheels, tyres and arches

Do the dirtiest exterior areas before the clean bodywork.

3. Pre-wash the bodywork

Loosen as much contamination as possible before contact.

4. Pressure rinse

Flush away the contamination released by the pre-wash.

5. Contact wash

Use automotive shampoo and appropriate clean wash media.

6. Rinse

Remove shampoo and loosened contamination.

7. Chemical decontamination

Use specialist chemicals for contamination actually present, such as iron or tar.

8. Mechanical decontamination if required

Clay only where bonded contamination remains.

9. Re-wash or thoroughly rinse

Remove decontamination chemicals, solvent residues and clay lubricant.

10. Dry thoroughly

Including panel gaps and trapped water.

11. Inspect the paint

Determine whether polishing is actually required.

12. Machine or hand polish if necessary

Use a test spot and appropriate abrasive process.

13. Prepare the surface

Remove polishing residue with the preparation method required by the chosen protection.

14. Apply protection

Wax, sealant or ceramic coating according to its instructions.

15. Detail the interior

Vacuum, clean, protect where required and work methodically through the cabin.

16. Dress tyres and exterior trim

Finish cleaned rubber and plastics.

17. Clean the glass

Leave the final glass clean until the rest of the vehicle is effectively complete.

18. Final inspection

Check every surface before considering the detail finished.

You Do Not Need Every Stage Every Time

This is probably the most important part of the entire guide.

"The correct order to detail a car" does not mean every car needs eighteen processes every weekend.

A normal maintenance detail might be:

Wheels → pre-wash → contact wash → rinse → dry → tyre dressing → glass → interior

A periodic protection detail might be:

Wheels → pre-wash → contact wash → decontamination → dry → light paint preparation → protection → interior → tyres → glass

A paint-correction detail might involve the entire process:

Wheels → pre-wash → contact wash → chemical decontamination → clay → re-wash → dry → paint inspection → machine polishing → panel preparation → coating → interior → finishing → glass → inspection

UK manufacturers themselves make this distinction. Bilt Hamber specifically notes that not all stages of its full detailing system need to be performed together, while Auto Finesse states that polishing and deeper decontamination are periodic processes rather than requirements after every maintenance wash.

The Logic Behind the Order

Instead of memorising a list, understand why it works.

Clean before you touch

Pre-wash reduces contamination before contact washing.

Wash before you decontaminate

Remove normal dirt before using specialist decontamination products.

Chemically decontaminate before mechanically decontaminating

Let chemicals remove the contaminants they are designed to dissolve before asking clay to physically remove what remains.

Decontaminate before polishing

Do not contaminate a polishing pad with material that should have been removed beforehand.

Polish before protecting

Abrasive polishing would remove protection if the order were reversed.

Prepare before coating

Protection needs the surface condition specified by its manufacturer.

Clean before dressing

Tyre and trim dressings perform better on properly cleaned surfaces.

Leave glass until the end

It is one of the easiest surfaces to contaminate while working on everything else.

That is the correct order because each stage leaves the vehicle ready for the one that follows.

Detailing Is a Process, Not a Product Checklist

The strongest detailing routine is not necessarily the one with the greatest number of stages.

It is the one where every stage has a reason.

If the paint is not contaminated, do not clay it.

If the paint does not need correction, do not polish it aggressively.

If the wheels are clean, do not automatically reach for the strongest wheel cleaner.

If a coating requires a particular surface-preparation system, follow that system rather than copying another product's instructions.

The professional approach is to assess:

what is on the surface

what needs removing

what result you want

what the next process requires

Then choose the least aggressive appropriate method.

Once you understand that, the correct order to detail a car stops being a checklist you have memorised.

It becomes a logical sequence:

clean → decontaminate → correct → prepare → protect → finish → inspect.