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Originally Posted by Fern
I guess i'm lucky cus my upstairs bathroom has 2 windows (facing south and west) plus an exhaust fan, so things dry out quickly.
About those black lights, i have one too, but if you notice when you shine it on the WALL there's all kinds of wierd stains there, too, and i know nothings' touched my walls except paint, so i question the accuracy of those things.
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the blacklight will highlight any organic based material that's on a surface. maybe you're seeing splotches from where someone placed their hand/s on the wall?