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Unread 04-11-2019, 06:36 PM   #7
Commercial Cleaning and Maintenance
Join Date: Apr 2004
Location: Arlington, outside Boston
Posts: 793

Not sure, worth a try. If it misses some spots, then you'll know.

The most common type of sealer, penetrating sealer Is not a thick topical film, it's absorbed inside the stone. It allows vapor transmission so it may allow bleach to get the mold stains.

Won't cost a lot of time or energy, so no reason not to try .

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