Last January we put new ceraminc tile in our kitchen. The sealer didn't last. I went to a tile company and got Phosphoric Acid Cleaner to clean the grout. It did pretty good except for one area. I cleaned that area 4 times and it still isn't to the normal color. I called the tile company and told them my problem. They told me to let it dry for 2 to 3 days. I did and it is the same color. I want to get it to a light gray before I put the sealer on. I need help! Peggy Pate
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