How to Prepare Your Car for a Wisconsin Winter

Protect the paint before the salt starts

The most useful thing you can do before winter is get a protective layer onto the paint while the weather still allows it.

Protection works by giving salt and grime something to sit on other than your clear coat, and by making the surface slicker so contamination releases more easily when you do wash. A protected car in February washes clean far more readily than an unprotected one.

Timing matters. This needs doing in October or early November, before the first brine application. Once salt season starts you are protecting a surface that already has contamination on it.

Pay particular attention to the lower third of the vehicle. That is where spray lands, and it is the area most owners and most quick washes neglect.

Deal with the interior before it gets closed up

A car in winter is a sealed damp box for five months. Whatever is in the carpet in November will still be there in April, and it will have had five months to develop.

Get the interior properly cleaned before winter, not after. Any organic material — food debris, spilled drinks, damp gym kit — will decompose more actively in a closed warm cabin than it does in summer when doors and windows are open regularly.

This is also the moment to deal with any existing smell. Winter makes odours worse because there is no ventilation and the heater circulates air across damp carpet. A problem you can live with in September becomes genuinely unpleasant by January.

Floor mats are the highest-value item

If you do one interior thing before winter, get proper rubber or all-weather mats.

Carpet mats absorb slush and hold it against the carpet underneath. Rubber mats with a raised lip contain the meltwater and can be lifted out, emptied and rinsed. The difference over one Wisconsin winter is substantial.

Lift and clean the carpet underneath before you fit them. There is no point trapping this winter's salt on top of last winter's.

Rubber seals and door locks

Door and window seals dry out and crack in cold. A dried seal lets water in, and water that gets in and freezes will tear the seal properly.

Treating rubber seals before winter with an appropriate rubber conditioner keeps them pliable and reduces the chance of a door freezing shut. This is a five minute job that people discover the value of at 7am in January.

The same applies to the rubber around the trunk or tailgate, which is where water sitting in a seam then freezing does real damage over a few seasons.

Glass, wipers and the inside of the windscreen

Clean interior glass matters far more in winter than summer. Days are short, so more of your driving is in the dark, and oncoming headlights scatter badly on a hazy windscreen.

The film on the inside of a windscreen is a mix of plastic off-gassing and road dust, and it also holds condensation. A properly cleaned interior windscreen defogs faster and stays clear longer, which is a safety point rather than a cosmetic one.

Clean the wiper blades themselves as well as replacing them if they are streaking. Grit embedded in a blade edge scratches glass over a season of use.

Through the winter

Wash when you can, on days above freezing, and prioritise the underside, arches and rockers over the paint you can see.

Shake out and rinse floor mats regularly rather than waiting for spring. Salt in the mats is salt you are grinding into carpet daily.

Then book the proper reset for late March or early April, once brine application has genuinely stopped for the season.