crack a window overnight..... the air exchange will keep humidity levels down inside
be careful with rainx. Inside it might make it worse!
When I was a teenager still living at my parent's house back in the 1980's I was a rain x fan. I bought some rainx stuff sold to treat fogging on the inside. Seemed to be basically the same thing. I applied a test spot to my bathroom mirror. That was the first spot on the mirror to fog up!
Wasn't too many years ago I showered in there and noticed that it was still there!
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