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Help identifying brown stuff in bathroom

Posted: Tue Aug 22, 2023 9:34 pm
by Novice1234
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Hi all
I really need time help as I’m a novice to this world.

Recently I have noticed a brown dry substance around the bath room
Wiped clean and disinfected yet it re appears in a few days

It seems to also have popped up in an adjacent room.

Any idea of what this is ?
Had the regular diy specialist over and he said he never seen anything like it before…..

Really would appreciate the experts opinion