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Try throwing an insulating blanket over the window over night. Try it with a regular blanket if you don't have the bubble wrap with foil type. To reduce condensation you have to either reduce the moisture in your car or warm up the glass a bit so the moisture does not condensate at all. Think of it like double glazing only the insulating layer is a blanket not another layer of glass. This also works to keep off frost. I had good success with keeping off frost with just a foil blanket held on with some rare earth magnets.
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