Grout stain on Saltillo...?!

[hamlet_jones]

I have a kitchen/livingroom saltillo installation that I am having trouble with. The tiles were sealed with a gloss sealer (one coat) before grouting. This morning I discovered that the haze and residue won't come off, not even with a green scotch-brite. Is there an acid that I can use to take this crap off? If so, do I need to neutralize the acid afterwards? It's not a thick heavy residue, like caked cement or nothing, just this dark grey stain, heavier in some places than others...

-Hamlet

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[Mike2]

I'll move you over to the Cleaning, Restoration and Sealing Forum Hamlet.

From your post it's not clear if the tiles were sealed before or after grouting. A clarification on that point will be necessary. :)

[hamlet_jones]

Thanks, they were sealed before grouting. As an aside, I rummaged around in my garage and found some phosphoric acid. I splashed a little out on the floor, scrubbed it around a little, and rinsed/wiped it up with a wet sponge. This seems to take 98% of the stain up. I'm guessing this is my solution...

[Davestone]

Sulfamic acid crystals, or vinegar and water 50/50 would be better and less caustic.