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In response to
"STIS: I moved my grill and the mat underneath, and there was a lot of ick underneath that mat. I did an initial spray with the power washer but not"
by
kelly
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Looks like a mild case of efflorescence if the power washer couldn’t remove it. A damp mat on concrete can cause it. It should disappear on its own in
Posted by
Loyola
Mar 13 '24, 12:37
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a few months when the source of dampness is removed.
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