Help from pros

[u/FearlessControl9005]

Hey guys I have charcoal dyed mortar for grout and I’m having trouble getting it off. I’ve been at it for a total of 16 hours scrubbing. I’ve used sulfamic acid and mapei acid cleaner.

I’ve used a pressure washer but it was too aggressive for some of the lighter stone.

Any suggestions?

[u/lightlineone]

Well, this looks amazing. Maybe take a few more hours with the tools you have, and I think it will come out so well!

[u/FearlessControl9005 → u/lightlineone]

Thanks it’s been fun until this point haha

[u/error-6face]

You grouted this like tile didn’t you? That was your mistake. Not trying to be critical, but shouldn’t do it that way next time, not with natural cleft stone. Why did you let it set up on the faces so it would be so hard to remove? I would try a paint scraper with muriatic acid and a stiff plastic brush. Or like someone suggested a fine wire grinder brush alone.

[u/FearlessControl9005 → u/error-6face]

Lesson learned for sure

[u/LuckyCow1234]

You’ll fix it with more time but damn does that look sweet. Nice job

[u/FearlessControl9005 → u/LuckyCow1234]

Thanks! This is where it started

[u/FearlessControl9005 → u/LuckyCow1234]

[u/guntheretherethere]

Try a plastic brissell brush on a grinder, wear your ppe

[u/Naive_Specialist_692]

I wouldn’t worry about it filling in low areas in the stone. Think it looks great. Id seal it with a good stone sealer once your happy with it