Thread: Efflorescence
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Unread 01-23-2020, 03:22 PM   #1
Michael's tile
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Join Date: Jan 2020
Posts: 3

I installed some brick pavers in a sunroom indoors. After grouting with a dark brown grout(tobacco brown) we cleaned it with some sulfamic acid and the grout joints turned a grey color. I've tried to scrub the joints with a brush and water but they turn back grey when it dries. What can I do to fix this.
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