renogaw
Active Member
we had a tarp on top of our concrete garage floor for a while, when we removed the tarp, the concrete was covered by a thin, powdery white substance, that smelled somewhat like mold. it sorta smelled like mold, but after bleaching it twice so far, the white powder is still there, and it still smells. so it got me thinking, would the tarp on the concrete pull lime out of the concrete, and what would that smell like?