Hi, we recently installed this tile as accent in our newly built bathroom. Before applying sealant, our contractor started priming the walls of the bathroom and all these tiles seem to have absorbed the vapors and the offwhite color in the tile has become stained. Is it possible to clean them? How? Otherwise we have to break the whole bath again and reinstall it..Please advise. Also you seem to have run out of new tiles now. So can't even buy new tiles.