Short answer
Before winter, wash and decontaminate the car, apply sealant or ceramic protection, fit rubber mats and treat glass and seals. During winter, rinse salt off every one to two weeks including the underbody, and plan a thorough clean in spring.
Before the first snow: October and November.
The most important winter work happens before winter. Protection goes on clean paint, and it cannot be applied in sub-zero temperatures or on a car covered in salt. Do these in order, ideally on a dry day above about 10 degrees.
- Hand wash and dry with a pH-balanced shampoo, paying attention to lower panels and wheel wells.
- Decontaminate. Iron remover and a clay bar take off the embedded grit that stops protection from bonding. See the clay bar guide for how it works.
- Apply protection. A sealant or ceramic coating gives salt, brine and grime something to slide off. Wax is quicker but wears out sooner under constant washing.
- Treat the wheels. A wheel sealant or coating stops brake dust and salt from bonding to the finish.
- Treat the glass. A water-repellent glass treatment helps with slush and wipers, which really matters on dark commutes.
- Condition door seals. A rubber conditioner helps stop doors freezing shut.
If you would rather not do it yourself, the winter protection package from Jay's is built for exactly this window.
If you only have time for three jobs, make them a wash, a layer of protection and a set of rubber mats. Those three take care of most of what winter does to a car.
The interior: set it up for slush.
Water, salt and grit are all carried in by boots. Interiors suffer in winter because wet carpet takes a long time to dry in cold air, and trapped moisture can lead to musty smells.
- Fit rubber all-weather mats with raised edges. They trap meltwater and salt, and you can hose them off.
- Keep a small brush and a towel in the car to knock slush off boots before you get in.
- Vacuum regularly. Dry salt crystals are easy to pick up before they dissolve into carpet.
- Condition leather before winter. Heated seats and dry cabin air can dry it out and lead to cracking. See the leather seat care guide.
- Replace the cabin air filter, so your defrost and heat blow clean air and fog clears faster.
Keep an emergency tidy kit
A small bin bag, a microfibre towel, a compact brush and a spare pair of dry gloves live in the boot of a well-prepared winter car. When you get in with wet boots, a thirty-second wipe saves an hour of carpet cleaning later.
If you have children, check the car seat area. Wet snow suits and crumbs create a mix that sours quickly in a warm cabin.
During winter: the routine.
You do not need to do much, but you do need to do it regularly.
Every one to two weeks
- Rinse the whole car, including the underbody and wheel wells, on any day that is above freezing. A touchless wash with an underbody spray is a good compromise if you do not have a heated bay.
- Dry door jambs, seals and locks to stop them freezing.
- Wipe salt crust off the windshield wipers and washer nozzles.
After storms
- Clear snow from the whole car, including the roof. Snow sliding off onto the car behind you is a real safety problem.
- Use a plastic scraper rather than anything metal, and never pour hot water on frozen glass.
Once a month
- Hand wash if you can, and top up with a spray protectant.
- Empty and rinse floor mats and wipe any white salt lines on the carpet before they set in. The road salt removal guide shows the process.
Don't forget the lights and glass
Salt film dims headlights and fogs the glass, which matters more in short winter daylight. Wipe lenses and the inside of the windshield on your regular wash. Yellowed or hazy headlights get worse in winter, and headlight restoration is quoted with your vehicle if yours are tired.
What Ontario conditions do differently.
Lake-effect weather around Burlington and Oakville creates fast swings between snow, thaw, rain and a hard freeze. That cycle is worse for cars than steady cold, because meltwater carries salt into seams and then freezes there. Brine, which is sprayed before storms, clings to paint and undersides for days.
Commuting adds to the load. Time on the QEW, 403 or 407 means lots of spray from trucks and plows, so the front end, mirrors and lower doors take the heaviest hits. Parking outside overnight leaves a thicker film than a garage does.
For protection that survives the whole season, a coating is the most practical option. Our comparison of ceramic, wax and sealant helps you pick.
One more local point: tree sap and bird droppings are a summer problem, but evergreen needles and pine resin stuck to a car over winter can mark paint under snow cover. If you park under trees in a leafy street, brush the roof and hood clear when you can.
Common winter mistakes to avoid.
- Never washing in winter. Salt sitting for three months does more harm than any wash ever will.
- Automatic brush washes. They push abrasive salt around and leave swirl marks.
- Ignoring the underbody. It is where rust starts.
- Using hot water on frozen glass. It can crack it.
- Leaving wet mats in the car. They create humidity and odours.
- Skipping the spring clean. Salt residue keeps working after the roads dry.
A final one: do not assume a cold car cannot be polished or protected. The paint and the product both need to be above roughly 10 degrees, so if you missed the autumn window, it is better to wait for a heated garage or a mild day than to apply protection in the cold.
Getting help from Jay's.
The areas where professional help pays off most are the pre-winter protection and the post-winter reset. Jay's works from your driveway, office lot or garage and brings its own water, power and lighting. If the weather is poor, the visit is rescheduled free, or moved into a garage.
If your carpets or lower panels are already salted, the winter salt removal add-on is +$40. For a complete clean before the season, The Full Detail starts at from $176 $220. Get your quote in about a minute, or read the spring detailing guide for what to do once the snow melts.