Your car can look spotless after a wash and still feel rough to the touch. That's bonded contamination — iron fallout, tar and airborne particles that shampoo can't shift — and it's what sits between a good wash and a truly clean, smooth finish. This guide walks through the full decontamination process, step by step.
What is car decontamination?
Decontamination is the stage between washing and protecting, where you remove contamination that's chemically or physically bonded to the paint. It splits into two types:
- Chemical decontamination — sprays that dissolve contamination: an iron fallout remover for embedded brake dust and a tar remover for road tar and glue.
- Physical decontamination — a clay bar that pulls out anything still bonded to the surface.
Most cars benefit from both.
How to tell if your car needs decontaminating
After washing and drying, put your hand inside a thin plastic sandwich bag and glide it over the paint. Bonded contamination you can't see is easy to feel through the bag — if the surface feels rough, gritty or bumpy rather than glass-smooth, it needs decontaminating. Tar shows as dark specks on lower panels; iron fallout often shows as tiny orange-brown spots.
The decontamination process, step by step
Want everything in one go? Shop the full decontamination range — iron fallout remover, tar remover and clay bar.
How often should you decontaminate?
For most cars, a full decontamination two or three times a year is plenty — typically spring and autumn, plus before any major protection work. Daily-driven cars, or those parked near industrial areas, railways or busy roads, pick up iron fallout faster and may need it more often. A well-maintained, regularly protected car needs it less.