Drive fifty miles on a wet motorway and your car comes back a flat, dull grey. Rinse it and most of it stays. That layer is traffic film, and it is a different problem from ordinary dirt.
What it is made of
Traffic film is a mixture of road grime bound together with oily residue — diesel and exhaust deposits, tyre and brake wear, and whatever the road surface has shed. The oil is the important part. It is what makes the film cling to paint and glass, and what makes plain water run straight over the top.
This is why a rinse alone barely touches it, and why a shampoo aimed at gentle maintenance washing can struggle. A neutral shampoo is designed to lift dirt without stripping your wax. Traffic film needs something that can break down oil.
Where a traffic film remover comes in
A traffic film remover — TFR — is an alkaline pre-wash. The alkalinity is what cuts through the oily binder, so the grime lets go of the surface and can be rinsed away before you ever touch the car with a mitt.
That last point is the whole purpose. Every bit of grime you remove chemically is grime you are not dragging across your paint with a wash mitt. Traffic film is full of fine abrasive particles; removing it by contact is how cars end up covered in swirl marks.
How to use it in a wash
- Rinse the car to remove loose dirt.
- Apply the traffic film remover from the bottom of the car upwards, so the wetted area stays wet.
- Let it dwell for the time on the label — and do not let it dry on the paint.
- Rinse thoroughly, top down this time.
- Follow with a normal two-bucket contact wash using a neutral shampoo.
Our ADVANCED TFR is a concentrated gel, so it clings to vertical panels instead of running into the gravel, and the BASIC version is a simpler alkaline foam for regular use.
Alkaline is not the same as harmless
Because it is alkaline, a TFR will shorten the life of a wax or sealant with repeated use. That is the trade-off and it is usually worth it in winter, when the film builds up faster than protection wears off. Points worth respecting:
- Never apply to hot panels or in direct sun.
- Do not let it dry — that is when staining happens, particularly on trim and wheels.
- Rinse thoroughly, including shuts, arches and under the sills.
- Expect to top up your protection more often through winter.
Traffic film on glass
The film on the inside of a windscreen is a related but separate problem — that one is off-gassing from the interior plastics, not the road. Outside, traffic film is exactly why headlights go dim and why wipers smear: you are wiping oily grime around rather than removing it.
A proper wash of the glass, followed by a dedicated glass cleaner, fixes the smearing that no amount of screenwash will.
Before you start
Always read the label on the product you are using and follow the instructions on it for dilution, application and safety. Work in the shade on cool paint, and test anything new on a small, hidden area first — particularly on trim, wraps and finishes you are not familiar with.
Not sure which product fits the job? SWAG Fast Lane asks three quick questions and puts the right kit together for you.