Heavy Duty Water Spot Remover is a mildly acidic gel built to shift hard water spots and mineral staining that a normal wash will not remove. Chemical Guys states it works on paintwork, glass, metal, stainless steel and aluminium, and that it should not be used on mirrors, coated glass or coated metal, or over ceramic coating. Applied to a cool panel out of direct sun, rubbed in gently and rinsed off within 30 seconds, it is described as leaving a streak-free finish and prepping the surface for wax protection. It suits anyone tackling stubborn spotting after a wash, ahead of applying a wax or sealant, and pairs well with microfibre pads and towels kept aside for chemical work rather than general drying.