It's a weird 'furry' type stuff that seems to form around the expansion joints in the garage floor. Seems to happen when the weather warms up.
Sounds like self-induced saltwater to slab. WHERE you located ??
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get it in my garage every winter where the wife parks. from the salt and water melting. hose her down and squeegee it out every spring...

Is anybody else picturing gungatim's wife being hosed down and sqeegeed?
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Is anybody else picturing gungatim's wife being hosed down and sqeegeed?
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Efflorescence. Salts leaching out of the concrete and forming fuzz.
