Why road salt is harder on cars in southern Ontario than in many regions
Road salt (sodium chloride and calcium chloride mixes) lowers the freezing point of water on roads — useful for traction, hard on cars. The chloride ion accelerates oxidation on iron-based metals, which means it eats your car from the underbody up.
Southern Ontario applies salt heavily because the region experiences frequent freeze-thaw cycles where it stays just below freezing for weeks at a time. That is the worst-case scenario for chloride exposure: the salt does not wash away as snow, it sits on your car as wet brine.
How often should you wash in winter?
Industry guidance is every 1-2 weeks during salt season, with extra washes after a major storm or after driving on freshly-salted highways. If you commute on the 401, 407, QEW, or 403 daily, lean toward weekly.
Daily Wash Club members typically wash 2-4 times per week in winter — the membership math works out heavily in your favor compared to per-wash pricing during salt months.
What kind of wash actually removes road salt?
Standard tunnel washes that include underbody spray are sufficient for routine salt removal. The Lava Shine package at Popular Car Wash includes underbody spray, foam presoak, sealer wax, and fresh rinse — all of which target the wettable areas where chloride sits.
Touch-free chemistry-only washes can struggle with frozen salt brine because they rely on water pressure alone. Modern soft-touch tunnel wash with friction is more effective in deep winter.
- +Underbody spray: targets brake lines, fuel lines, exhaust mounts
- +Foam presoak: dwells on chloride deposits + lifts before rinse
- +Clear coat + sealer wax: protective barrier renewed each wash
- +Fresh rinse: avoids re-depositing salt-laden recycled water
Where to find a Popular Car Wash that handles winter well
All Popular tunnel locations across the GTA, Durham Region, and Hamilton offer winter-appropriate Express and Full-Service wash with underbody options. Self-serve bays at Whitby Building A (24/7), Hamilton, Port Perry, and Uxbridge let you target undercarriage and wheel wells yourself.
Frequently asked
Should I wash my car when it is below freezing?
Yes — Popular's tunnel wash uses heated water and the dryers remove most surface moisture. Avoid washing in extreme cold (under -15°C) if you can, but routine winter washes at typical Canadian winter temperatures are fine and important for salt removal.
Will winter washing freeze my doors shut?
Modern tunnel wash dryers leave the car nearly dry. Light residual moisture in door seams can freeze in extreme cold — open and close each door once before parking the car for the day after a wash to break any thin ice that forms.
Is road salt actually that bad for my car?
Yes. Untreated salt exposure over multiple winters significantly accelerates rust, especially on brake lines, fuel lines, and exhaust components. The Auto industry rates 5-7 winters of regular salt exposure as the typical onset of structural rust on unprotected vehicles in the GTA.