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Would the shaving cream trick work for your car windows?
I know if you put shaving cream on a mirror in the bathroom and then wipe it off, it leaves a residue that keeps your mirror from fogging up after showers.
Would the same thing work if you applied it to the inside of your car windows and mirror?
On a side note, is Rain-X bad for your windshield, wipers, or car in any way?
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