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I'm working on replacing some laminate in my bathroom with tile. I ripped up the laminated and the particle board (which was black near the bathtub) the subfloor underneath appears to be black as well near the bath tub. Should I replace it? Or just try and clean it? Or do nothing and just lay the tile.

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Black like mold? Spraypaint? Can you post a picture? –  Grant May 12 at 3:05

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