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Old 09-26-2009, 01:20 PM   #1
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Removing cured grout from surface of slate tiles


I had my bathroom re-tiled in slate by a handyman acquaintance of my wife. Work was pretty good but he didn't do a good job of cleaning excess grout from surface of tiles. I have several tiles with a haze, but more importantly, I have at least 6-10 spots of grout on some of the tiles that were never cleaned up. He was supposed to come back, and because he had his check, he never did. So now, the grout is long cured, and I'm at a loss as to how to remove without damaging the tiles.

Any advice would be appreciated.

Thank You!
Mike

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Old 09-26-2009, 04:08 PM   #2
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Removing cured grout from surface of slate tiles


First, try white vinegar and a toothbrush. Vinegar is a mild acid that will sometimes accomplish such tasks.

If that doesn't work use sulfamic acid crystals and a toothbrush.

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Old 09-26-2009, 06:38 PM   #3
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Removing cured grout from surface of slate tiles


Thank you, I'll give it a shot!
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Old 09-27-2009, 06:39 AM   #4
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Removing cured grout from surface of slate tiles


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Thank you, I'll give it a shot!
vinegar 1 part, to about 3-4 parts water, then clean water after...good advice from bud...why do people never finish the job??? oh well, good luck
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Old 09-27-2009, 03:54 PM   #5
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Removing cured grout from surface of slate tiles


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First, try white vinegar and a toothbrush. Vinegar is a mild acid that will sometimes accomplish such tasks.

If that doesn't work use sulfamic acid crystals and a toothbrush.
Thanks for the advice, I tried diluted vinegar this morning, and then full strength, removed about 25% of the excess grout. There are quite a few spots that are fairly thick and actually laughed at the vinegar when I put it on. Will try the sulfamic acid next.

Thanks again
Mike
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Old 09-28-2009, 01:38 PM   #6
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Removing cured grout from surface of slate tiles


Use a razor blade scraper to reduce the quantities of thinset first then go back with the vinegar. Be careful not to mar the tile with the scraper.

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