How do you clean/remove the layer of epoxy on the tiles if the tiles get dirty before it dries?
If the epoxy grout is cured on the tiles you should try an epoxy grout haze remover like Miracle Sealants Epoxy Grout Film Remover. If the grout is just applied and has not cured, grouting sponge soaked in water should get any dirt and grout off the tiles. Please give us a call if you need further assistance. (800) 938-7925 and we can make recommendations for your situation.