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The "no wash in winter" really only applies to places that stay consistently below zero, which is not Vancouver.
The freeze/thaw cycle accelerates rust as the snow melts and the salt gets into various the crevices. If the salt can stay stuck where it is, then it is less likely to get into those cervices. Remember though, even a good wash doesn't clean all these cervices, especially inside of doors.
This is why in the rust belts of Canada (aka the rest of Canada) its common to rust proof your car by spraying it with oil. The oil gets into all the crevices, preventing salt from building up there even with the freeze/thaw cycle. Then you really don't want to wash your car and risk losing that layer of oil protection.
Long story short: wash your car if you want to.
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