AtFountain Valley Tile Cleaning Expertswe are here to refinish, polish, protect and restore your tile and any other natural stone surfaces back to its original magnificent condition. As a dense colored substance used to hold tiles together and filling the openings in between them, grout helps improve an entire room and avoid substances from getting under the tiles. When grout gets dirty, it can make the tile look old and discolored and the whole floor can get mildew, mold, and lime scale below it.