Found out it's kind of common. I would post a link to the thread, but then TRF is down. I think Bob Cox started it. Haven't heard from him in a while though. Anyways, someone posted a pic of their tub with fungus too, and it looked nasty. In my post in the thread, I said that I used rubbing alcohol to remoisten the FnF so it wouldn't dry out (I don't know why I used alcohol) and I think that helped to stop the mold from spreadding as quick.

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Josh
NAR #87993