I tried with and without the fan but same problem. I think with the fan you are still drawing in wet air and it's going to condense on the mirror. I thought about heater pads on the mirror but you don't see them commercially available - I guess for a good reason. I also tried heating the air going into the fan in an attempt to warm the mirror and remove the dew but the hair drier didn't have enough power to raise the mirror temperature enough.
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