# Help identifying and treating this tile

**URL:** <https://pressurewashingresource.com/community/t/help-identifying-and-treating-this-tile/40709>\
**Category:** Stains/Surfaces\
**Created:** [February 22, 2026, 3:07am UTC](https://pressurewashingresource.com/community/t/help-identifying-and-treating-this-tile/40709 "2026-02-22T03:07:30Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![JamesTown](https://pressurewashingresource.com/community/letter_avatar_proxy/v4/letter/j/7cd45c/32.png) [@JamesTown](https://pressurewashingresource.com/community/u/JamesTown)\
**Post date:** [February 22, 2026, 3:07am UTC](https://pressurewashingresource.com/community/t/help-identifying-and-treating-this-tile/40709/1 "2026-02-22T03:07:30Z")

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hello, i did a little pressure washing at a house yesterday and used bleach and a pressure washer on it as well as acid cause it wouldnt budge with the SH but this black doesnt really come off. some of the tile chipped but the black seems to be stained. doesnt anyone have any idea how to treat this? Home owner says its never been painted. thanks.

 ![tile 3](https://pressurewashingresource.com/community/uploads/default/original/3X/c/c/ccf4c139feda8be15240c53353da591bb62a6c08.jpeg)

 ![tile 2](https://pressurewashingresource.com/community/uploads/default/original/3X/3/e/3e62a24e025fb29448ba6b241b875fc32fd6f48a.jpeg)

 ![tile 1](https://pressurewashingresource.com/community/uploads/default/original/3X/6/8/68b9fe7d064040763222e76de88311991e8ef58e.jpeg)

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**Author:** ![OhioFloMo](https://pressurewashingresource.com/community/user_avatar/pressurewashingresource.com/ohioflomo/32/44431_2.png) [@OhioFloMo](https://pressurewashingresource.com/community/u/OhioFloMo)\
**Post date:** [February 22, 2026, 1:06pm UTC](https://pressurewashingresource.com/community/t/help-identifying-and-treating-this-tile/40709/2 "2026-02-22T13:06:16Z")

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Looks like slate to me… you aren’t going to get that color out as it occurs naturally.

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**Author:** ![qons](https://pressurewashingresource.com/community/user_avatar/pressurewashingresource.com/qons/32/27810_2.png) [@qons](https://pressurewashingresource.com/community/u/qons)\
**Post date:** [February 23, 2026, 5:19pm UTC](https://pressurewashingresource.com/community/t/help-identifying-and-treating-this-tile/40709/3 "2026-02-23T17:19:19Z")

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What % SH did you use?

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<div class="post-metadata">

**Author:** ![JamesTown](https://pressurewashingresource.com/community/letter_avatar_proxy/v4/letter/j/7cd45c/32.png) [@JamesTown](https://pressurewashingresource.com/community/u/JamesTown)\
**Post date:** [February 23, 2026, 5:42pm UTC](https://pressurewashingresource.com/community/t/help-identifying-and-treating-this-tile/40709/4 "2026-02-23T17:42:49Z")

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Started with 2% and then after a pass came back with 6%.

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**Author:** ![qons](https://pressurewashingresource.com/community/user_avatar/pressurewashingresource.com/qons/32/27810_2.png) [@qons](https://pressurewashingresource.com/community/u/qons)\
**Post date:** [February 23, 2026, 7:51pm UTC](https://pressurewashingresource.com/community/t/help-identifying-and-treating-this-tile/40709/5 "2026-02-23T19:51:16Z")

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Looks like it might be flagstone. I’ve had flagstone where I’ve had to use straight SH, around 10-12%. It’s about the only time I’ve ever had to go that strong.

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<div class="post-metadata">

**Author:** ![JamesTown](https://pressurewashingresource.com/community/letter_avatar_proxy/v4/letter/j/7cd45c/32.png) [@JamesTown](https://pressurewashingresource.com/community/u/JamesTown)\
**Post date:** [February 23, 2026, 10:01pm UTC](https://pressurewashingresource.com/community/t/help-identifying-and-treating-this-tile/40709/6 "2026-02-23T22:01:29Z")

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The rest of the flagstone cleaned up just fine with the ~2%. I guess I could try nuking it with 12% but that just seemed like it would be such a waste.

Can anyone else confirm 12% is appropriate?

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**Author:** ![qons](https://pressurewashingresource.com/community/user_avatar/pressurewashingresource.com/qons/32/27810_2.png) [@qons](https://pressurewashingresource.com/community/u/qons)\
**Post date:** [February 23, 2026, 10:24pm UTC](https://pressurewashingresource.com/community/t/help-identifying-and-treating-this-tile/40709/7 "2026-02-23T22:24:55Z")

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Do a test spot. No need to waste.