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The film I-84 leaves on a Southington commuter car

Cars that run exits 28 to 32 daily pick up a bonded film that a wash will not remove. What it is made of, and why clay is the step that actually takes it off.

The flank of a silver car coated in grey-brown highway road film, with one clean finger-swipe through it showing the paint underneath.

Southington is laid out along I-84 between exits 28 and 32, with I-691 branching at exit 4. A very large number of local cars do highway miles every single working day, and highway miles put something specific on paint.

What highway film actually is

At 65 mph a car is not just getting dusty. It is being sandblasted with a mixture of atomised oil, tyre rubber, hot brake dust off the vehicle in front, and road tar thrown up in warm weather.

The hot metallic particles are the problem. They land on the clear coat with enough energy to embed rather than rest on top, and once embedded they begin to corrode in place. That is what makes the paint feel gritty when you run a hand over it after washing, and it is why a freshly washed commuter car can still look flat.

Wash it as often as you like and the film stays, because washing removes what is sitting on the surface and this is not sitting on the surface.

Bugs are a deadline, not a nuisance

Insect remains are acidic. On a warm panel they begin etching the clear coat within a day or two, and the front bumper, mirrors and leading edge of the bonnet take the worst of it.

Removed the same week, they come off and leave nothing. Left through a hot summer month, they leave small dulled craters that need machine work rather than washing. The timing is the whole story, and it is why the front third of a highway car ages faster than the rest.

Clay is the step that changes it

A clay bar shears off bonded contamination that washing cannot reach — embedded iron, tar and overspray — leaving the clear coat genuinely smooth instead of merely clean. Run your hand over a panel before and after and the difference is immediate.

It is included in our exterior detail at $145 and in a full detail at $275. In the wider market it is often sold as a paid add-on at around $119, which tells you it is real work rather than a marketing word.

After the clay, a sealant gives the next few months of highway film something to sit on other than bare clear coat, so it rinses off instead of bonding.

What it will not fix

If the etching has already happened — the small dull marks that stay visible on a clean, dry panel — that is removed by machine polishing, not by washing or clay. That is paint correction at $449, and we will tell you honestly whether you need it or whether a good exterior detail will do.

Exterior car detailing, at your home in Connecticut

Two-bucket hand wash, clay bar decontamination and a six-month sealant.