Keep a clean blackboard eraser inside your glove compartment and erase condensation when it fogs up your windshield or glass doors. Works like a charm!
My grandfather owned a shop his whole life and the secret to not getting fogged up in the first place is to make sure air flow is coming from the outside- fresh air (not recycling in the inside) and the heat should be on a warm (not hot, not cold) setting. If you use the defogger any other way it will not work properly. Trust me..this works.
If you have a car with air conditioning, you should always have the air conditioner turned on, even on the coldest days. Simply adjust the temperature to warm/hot. This keeps the seals lubricated, so the freon doesn't leak, and also the a/c works as a dehumidifier during the winter. You should never have to worry about condensation on the inside of your windows again ! It keeps your air conditioning unit from needing repairs as well.
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