Heh... you know, I forgot another option, from my youth in New England...
There's a product called Glass Wax that is made for cleaning glass, but at Christmas time it was a regional tradition to use a sponge to "paint" snowscapes and winter scenes on the inside of house windows, frosting them. After the season, you would just wash it off. There used to be a seasonal TV ad showing this family ritual every year.
I have a can of it somewhere. I suspect it may not survive many steamy showers, but it's worth a try.
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2019 Cougar 26RBSWE
2019 Ford F-250
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