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Unread 10-21-2006, 03:07 PM   #2
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Join Date: Feb 2005
Location: Southeast Michigan
Posts: 63
No expert here, but ran into same problem myself. I used Sulfamic Acid -found at Home Depot if I remember correctly. Comes with lots of warnings, but it went pretty easily. I think I had to wet the floor with a mop first and make sure it stayed wet. The acid came in powder form. You need to mix it pretty weak. Hopefully some of the experts on here can give you the ratio-or you may be able to look through my old posts and find out. Someone on here suggested it to me after all... After that I just used a plastic scrub brush and went at it. Worked like a charm. I think the only thing you have to fear is eating away your grout, but it turned out excellent for me. Good Luck
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