We put new ceramic tile in our kitchen this last January. The sealer didn't last so we decided to clean the grout and redo the sealer with a better quality one. We went to a tile company and got Aqua Mix Phosphoric Acid Cleaner. The cleaner worked on most of the kitchen except one area. I cleaned that area 4 time and it didn't change. I called the tile company and they said to let it dry for 2 to 3 days. I did and it didn't change. My grout is a light gray. I need Help! Peggy Pare
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