The Chemical That Does Ninety Per Cent Of The Work On A Dirty Vehicle

Watch a professional wash a filthy lorry, and the pressure washer looks like the tool doing the work. It is not.

The chemical does the work. The machine applies it and rinses it off. Get the chemical and the dwell time right, and the job takes a fraction of the time, with less pressure and far less damage to what you are cleaning.

On vehicles, that chemical is almost always traffic film remover.

What traffic film actually is

Traffic film is the grey-brown layer that builds on any vehicle that uses a road. It is not simply dirt.

It is a bonded mixture of diesel and oil residue, brake dust, tyre particles, road salt in winter, and general grime, held together by the oily component. That oil content is why plain water and pressure struggle with it. You are not trying to dislodge loose dirt; you are trying to break an oily bond.

What TFR is and how it works

Traffic film remover is an alkaline detergent. It works by saponifying the oils and greases in traffic film, which means chemically converting them into something water-soluble that then rinses away.

That is a genuinely different mechanism from a normal car shampoo, which lifts loose dirt and suspends it. TFR attacks the bond.

Two consequences follow directly from being alkaline, and both matter.

It strips wax and sealant. Any protective layer on the paint comes off with the traffic film. On a fleet vehicle, nobody cares. On a detailed car, it undoes the protection you paid for.

It can damage some surfaces if left too long or used too strongly, particularly polished aluminium, anodised trim, and some plastics. Aluminium is the one that catches people out, which is why dedicated aluminium cleaners exist.

Dilution: the part everyone gets wrong

Neat TFR is not stronger cleaning. It is wasted product and a damage risk.

Typical working ranges, and always check the label on your specific product:

• Light soiling, regular washing: heavily diluted

• Moderate traffic film: mid-range dilution

• Heavy commercial soiling: stronger, but rarely anywhere near neat

Getting this right saves real money at fleet volume, and we cover the numbers in detail in our traffic film remover dilution guide.

Three rules regardless of the ratio:

Never let it dry on the surface. A dried alkaline detergent streaks, and on aluminium and trim it leaves marks. Work in sections, and on a hot day work smaller sections.

Respect the dwell time. Too short and it has not worked. Too long and you risk the surface. The dwell time is not a suggestion.

Apply bottom to top on a vehicle, rinse top to bottom. Applying upward stops the chemical from running down over dry panels and creating streaks that will not come out.

TFR or snow foam?

Different tools for different jobs.

Snow foam is a pre-wash. It clings, softens and lifts loose grit so it can be rinsed before a contact wash, which protects the paint from swirl marks. It is generally pH-neutral and does not strip wax.

TFR is a degreaser. It removes bonded oily film. It is alkaline, and it does strip protection.

For fleet and commercial vehicles: TFR, every time. Speed and cleaning power matter, and nobody is protecting a wax layer on a tipper.

For detailing and valeting a customer's car: snow foam as a pre-wash, and TFR only where genuinely needed, such as heavily soiled arches, sills and wheels.

Using TFR on a detailed car every week will keep it clean and gradually remove every bit of protection on it.

Safety, which is not optional at commercial strength

Concentrated TFR is a strong alkali.

• Eye protection and gloves whenever you handle the concentrate

• Never decant into an unlabelled container, and never into a drinks bottle

• Store away from acids, including limescale and wheel cleaners, because alkalis and acids react

• Keep the safety data sheet accessible, which is a COSHH requirement where it is used at work

• Ventilate when using it in an enclosed wash bay

Where the run-off goes

This is the part that catches growing operations.

TFR run-off carries detergent, oil, brake dust and heavy metals. That cannot lawfully go into a surface water drain, which is what most yard and car park gullies are, and which usually discharges untreated to a watercourse.

At any volume, you need an interceptor and, for discharge to foul, a trade effluent consent from your water company. For mobile work, ask where the drains go on every site and carry drain mats.

Frequently asked questions

What is traffic film remover?

Traffic film remover, usually shortened to TFR, is an alkaline detergent that removes the bonded layer of diesel residue, oil, brake dust, road salt and grime that builds up on vehicles. It works by chemically converting the oils into something water-soluble, which is why it deals with traffic film when plain water and pressure cannot.

Does TFR damage paint?

Used at the correct dilution and rinsed before it dries, TFR is safe on automotive paint. It does strip wax and sealant, so it removes any protective layer. Problems come from using it neat, letting it dry on the surface, or leaving it well past the stated dwell time, and polished aluminium and some trim are more vulnerable than paint.

What is the correct dilution for traffic film remover?

It depends on the product and the soiling, so always follow the label. As a general pattern, light regular washing needs heavy dilution, moderate traffic film needs a mid-range ratio, and heavy commercial soiling needs a stronger mix but rarely anything close to neat. Using it neat wastes product and risks damage.

Should I use TFR or snow foam?

Use TFR for fleet and commercial vehicles, where cleaning power and speed matter and there is no wax to protect. Use snow foam as a pre-wash when detailing, since it lifts loose grit to prevent swirl marks and does not strip protection. Many detailers use snow foam generally and TFR only on arches, sills and wheels.

Can TFR run-off go down the drain?

Not into a surface water drain, which is what most yard and car park gullies are and which usually discharges untreated to a watercourse. Run-off carries detergent, oil and heavy metals. At volume, you need an interceptor, and discharge to a foul drain normally requires a trade effluent consent.

The bottom line

The machine rinses. The chemical cleans.

Dilute it properly, never let it dry, respect the dwell time, and know where the water goes. Get those four right, and you will clean faster, at lower pressure, with less damage and less product.

RealKleen supplies professional traffic film removers, snow foams and aluminium-safe cleaners alongside the machines to apply them, and has done so since 1980. Tell us what you are cleaning, and we will get the chemical and the dilution right.