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Unread 09-01-2016, 07:26 AM   #1
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Join Date: Sep 2016
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Stained grout

I just installed some natural stone tile for the first time. I filled instructions and cleaned the tile and grout with a water/vinegar solution. The first cleaning went fine. The grout returned to original color. The second cleaning, 2 days later, it still looks wet or stained in some areas.

An image is attached.

How can I resolve this? Please help!!
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Unread 09-01-2016, 09:03 AM   #2
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Location: NW Arkansas, Ozark Mountains
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Welcome to the forum, Bill.

Could you tell us a few things about the grout and how you installed it?

What brand of grout is it?

How long after the grout was installed did you use vinegar on it?

What ratio of vinegar/water did you use?

What brand of thinset mortar did you use, and was it gray or white?

What is the substrate, as in the tile backer, or is the stone directly over the subfloor?

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Unread 09-01-2016, 10:54 AM   #3
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Location: Hood County Texas
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And what type of natural stone is that?
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