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From the Frozen North: (It's -16 here this morning...)
Most of us that want to keep our cars in decent shape don't use heated garages. The problem is condensation. The freezing/thawing cycle is really hard on your car. Condensation can get into the fuel system, braking system, etc. It is very hard on the exterior surfaces as you have figured out. The thawing allows salt and other melting agents to become liquid on your car, and they are much more active in that state.
I keep my car in the garage, unheated. It keeps the snow and frost off. Then, on cold nights, I use the block heater to take the strain off the engine. I also use synthetic oil as it has a much lower pur point and flows much quicker in the cold. At least once a week it goes to the car wash.
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