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The Best Way to Clean Textured Ceramic Tile... worth a try...
Another pinner said: Clean floor tile grout using Oxyclean. I used this on our floors in our home and they looked new again. Hint-- I bought a long handled(broom size) scrub brush to make the job easier. Let it soak then brush the dirt away. It works! Our new home will have tile throughout and I plan to use this when needed.