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Unread 01-21-2020, 12:35 PM   #4
ss3964spd's Avatar
Join Date: Jul 2005
Location: Fairfax, Va
Posts: 3,187
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The dark grout lines in the green tile sure looks like mold to me, Evan.

Did you spray any common mold and mildew cleaner on it first? If yes, did it lighten the dark lines at all?

Any idea what is behind the tile - the type of wall board?
If I recall correctly my memory is excellent, but my ability to access it is intermittent.
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