I am surprised more Canadians didn't get in on this topic. We have already had snow in the mountains and the ski areas are hoping for record amounts this year.
Best advice is before it gets too cold, use your favorite sealant and wax. Then use a coin-op wand wash bay - where they don’t recycle the water – as often as possible.
If the temperature stays below freezing the corrosion process is slowed considerably; however, when it gets warmer you need to be washing the vehicle top to bottom. Don’t forget the engine bay and undercarriage. More scary is the rock chip damage from street salting and sanding.
:scared