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Rain repellent screen wash concentrate

Car-Chem Screen Wash Water Resistant

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Car-Chem Screen Wash Water Resistant £7.50
Click & Collect: Ilkeston · FreeMost eligible orders are ready within 5 minutes during opening times. Please wait for your collection-ready confirmation before travelling. Click & Collect: Ilkeston Not available for this option. Options that can be collected show it here. How it works

Car-Chem Screen Wash Rain Resist is the ultimate concentrated screen wash additive for your vehicle! Simply dilute at a ratio of 10:1 to give your washer fluid cleaning power while also coating your wind shield with a hydrophobic barrier. Screen Wash Rain Resist will also improve the effectiveness of your current wiper blades.

  • Concentrated screen wash additive
  • Mixes with water at 10:1
  • Adds cleaning power to washer fluid
  • Coats the windscreen with a hydrophobic barrier
  • Rain beads and runs off the glass
  • Helps wiper blades work more effectively
  • Used through your existing washer system
  • De-ionised water helps reduce water spots
Read the full description

Full Description

Car-Chem Screen Wash Rain Resist is the ultimate concentrated screen wash additive for your vehicle! Simply dilute at a ratio of 10:1 to give your washer fluid cleaning power while also coating your wind shield with a hydrophobic barrier. Screen Wash Rain Resist will also improve the effectiveness of your current wiper blades.

Using Screen Wash Rain Resist ensures rain will simply bead and run off the windscreen, providing a cleaner and safer wind shield while driving.

More in Screen Wash.

Tracked UK delivery, or collect eligible orders from our Ilkeston store.

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Key features

  • Rain Repellent
  • 10 To 1
  • Screen Wash Additive
  • Concentrated Formula

The Drivers HQ

Expert Notes

Car-Chem Screen Wash Rain Resist is a concentrated screen wash additive that does two jobs through the washer system: it gives the washer fluid cleaning power and coats the windscreen with a hydrophobic barrier, so rain beads and runs off the glass. Car-Chem also states it improves the effectiveness of existing wiper blades. It is mixed at 10:1 with water, and the maker's guide is 500ml of concentrate for an average 5L reservoir, ideally after emptying the tank and topping up with de-ionised water. It suits drivers who cover a lot of wet miles. Keep good wiper blades fitted, and check the label for frost protection before winter, switching to a winter screen wash when needed.

Perfect For / Suitable Surfaces

  • Windscreens
  • Washer fluid reservoirs
  • Cars
  • Vans
  • Wet weather driving
  • Motorway journeys in the rain

Caution: Car-Chem does not list a freezing point for this additive, so check the label before relying on it in sub-zero weather. Pour carefully and wipe spills off paintwork.

Technical Specifications

Product Type
Rain Repellent Screen Wash Additive
Brand
Car-Chem
Also Known As
Screen Wash Rain Resist
Format
Concentrate
Dilution
10:1 With Water
Dosing Guide
500ml Per Average 5L Washer Reservoir
Key Property
Hydrophobic Windscreen Barrier
Application Method
Added To The Washer Fluid Reservoir
Water Advice
De-Ionised Water Where Possible
Primary Use
Windscreen Cleaning And Rain Repellency

How To Use

Application

  1. Where possible, empty the washer fluid reservoir fully first.
  2. Add the concentrate at 10:1, Car-Chem's guide being 500ml for an average 5L reservoir.
  3. Top the reservoir up to full with water.
  4. Use de-ionised water where possible to reduce the chance of water spots.
  5. Run the washers for a few seconds to draw the new mix through the jets.

Aftercare

  1. Use the washers as normal to keep the screen clean and treated.
  2. Top up with the same 10:1 mix to keep the strength consistent.
  3. Replace split or worn wiper blades to keep the screen clearing cleanly.
  4. Keep the bottle capped, upright and out of reach of children.
  5. Wipe any spills from paintwork and engine bay parts promptly.

Top Tip: Fill the reservoir with de-ionised water where possible, as Car-Chem advises this reduces the likelihood of water spots.

Performance Benefits

  • Rain beads and runs off
  • Keeps the windscreen cleaner
  • Helps wipers clear the screen
  • Coats the windscreen as you wash
  • Designed for driving in wet weather
  • Poured straight into the reservoir

Frequently Asked Questions

What does this screen wash do?

Car-Chem Screen Wash Rain Resist is a concentrated additive that gives washer fluid cleaning power while coating the windscreen with a hydrophobic barrier. Rain then beads and runs off the glass.

How much do I add?

Dilute it at 10:1 with water. Car-Chem's guide is 500ml of concentrate for an average 5L washer reservoir, topped up to full with water.

Do I need to empty the washer tank first?

Where possible, yes. Car-Chem recommends emptying the washer tank fully before adding the concentrate and topping up with water.

Will it help my wipers?

Yes, Car-Chem states that Screen Wash Rain Resist improves the effectiveness of your current wiper blades. Split or worn blades should still be replaced.

What water should I mix it with?

Use de-ionised water where possible. Car-Chem advises this to reduce the likelihood of water spots.

Is this Car-Chem Screen Wash Rain Resist?

Yes. Car-Chem names this product Screen Wash Rain Resist, a concentrated screen wash additive with a hydrophobic effect on the windscreen.

Can I use it in freezing weather?

Do not rely on it for frost protection, as Car-Chem publishes no freezing point for this additive. Check the bottle label and use a winter screen wash when sub-zero temperatures are expected.

Where can I buy it?

Car-Chem Screen Wash Rain Resist is available from The Drivers HQ with UK-wide delivery, and our walk-in store is in Ilkeston, Derbyshire.

HQ Suggests Tips & Insights

  1. Empty the washer reservoir fully before adding the concentrate.
  2. Mix at 10:1 with water for the correct strength.
  3. Fill with de-ionised water where possible to limit spotting.
  4. Start with a clean windscreen for the most even coverage.
  5. Replace split or worn wiper blades promptly.
  6. Check the label before relying on it in freezing weather.
  7. Wipe spills off paintwork straight away.
  8. Order online with UK-wide delivery from The Drivers HQ.

The Brand

Car-Chem

Car-Chem is a car care manufacturer with an on-site laboratory, a dedicated research chemist and a production facility in Nottingham. The company says it has researched, developed and produced car care since 2010, and that its products are trusted by professionals and enthusiasts in over 40 countries. In 2024 it was acquired by Leading Solvent Supplies, a UK chemical group, and alongside its own Car-Chem range it develops and produces private label products for other businesses.

The Drivers HQ stocks Car-Chem across the whole wash and protection routine, with several products in 500ml and 5L sizes. For washing there is Pre Soak+ Snow Foam, Citrus Clean, Total Clean Traffic Film Remover, 1900:1 Shampoo and Clean Wheels. Protection comes from Sapphire Ceramic Wax, Connoisseur Carnauba Wax and Hydro Quick Detailer, with Prep Panel Wipe to ready the paint. Inside there is Interior Clean Coat, Hide Leather Cream and Refresh Odour Eliminator, and for glass, Pre Icer and Screen Wash Water Resistant.

Car-Chem suits enthusiasts who want to build a complete kit from one maker, and detailers who get through a lot of product, since the 5L sizes are handy for refilling smaller bottles. A typical routine starts with snow foam and a citrus pre-wash to loosen dirt before a careful contact wash with shampoo, then the wheels. Panel wipe removes oils before a ceramic or carnauba wax goes on, and a quick detailer keeps the finish topped up between washes. Glass and interior products finish the car inside and out.

Buy Car-Chem from The Drivers HQ with UK-wide delivery, or visit our walk-in store in Ilkeston, Derbyshire, where Click & Collect is free. Whether you are restocking a favourite shampoo in a larger size, trying a ceramic wax or putting together a winter glass kit with Pre Icer and screen wash, you can combine Car-Chem products with the rest of your detailing and car care essentials in a single order.

Shop all Car-Chem
Car Chem 1900:1 Shampoo (500ml and 5L) - The Drivers HQ

Developed and Made in Nottingham

Car-Chem describes itself as a manufacturer and innovator in the automotive care industry, and says it has researched, developed and produced car care since 2010. Its on-site laboratory, dedicated research chemist and production facility are in Nottingham, and the company says it maintains quality control at every stage so that every product and its packaging comply with UK and international regulatory standards.

In 2024 Car-Chem was acquired by Leading Solvent Supplies, a UK chemical group. The company says the move gives it greater investment in research and development and more production capacity, while it keeps its own brand identity and expert team. Its products, it says, are still developed and produced by Car-Chem at its Nottingham facility.

Alongside its own range, Car-Chem develops and produces private label products for businesses from global corporations to specialised niche brands. The company says its formulations are trusted by professionals and enthusiasts in over 40 countries.

CARCHEM SAPPHIRE CERAMIC WAX - The Drivers HQ

From Snow Foam to Ceramic Wax

Car-Chem describes 1900:1 Shampoo as a highly concentrated shampoo that cuts through dirt, grime and road contaminants while preserving waxes, sealants and ceramic coatings, with lubricants that give a smooth glide and reduce the risk of swirls, scratches and marring. Before the contact wash, Pre Soak+ Snow Foam lifts dirt and grime from exterior surfaces without stripping sealant or wax, and Citrus Clean is a versatile cleaner for jobs inside and outside the car, diluted with water to suit the task.

Clean Wheels is an acid-based spray cleaner that the brand says is suitable for alloy, painted and plastic-trimmed wheels, lifting brake dust, grit and grease. When the paint is clean, Prep Panel Wipe removes oils and silicones to leave a streak-free surface ready for last stage protection.

For that protection, The Drivers HQ stocks Sapphire, an SiO2 based ceramic wax, and Connoisseur Carnauba Wax, which protects against contamination while adding to the natural gloss of the paint, with Hydro Quick Detailer adding a thin layer of hydrophobic sealant between washes. Pre Icer is a glass coating that helps stop ice settling on treated glass, Screen Wash Water Resistant is a screen wash additive that coats the windscreen with a hydrophobic barrier, Hide Leather Cream moisturises leather and Refresh Odour Eliminator targets bad smells at the source.

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