ammonia or bleach to clean grout is bleach bad for grout will bleach discolor grout tile doctor grout really clean use oxygen bleach is bleach bad for grout top five tile and grout myths dispelled use bleach to clean bathroom tile grout porcelain shower tile did i ruin the use bleach to clean bathroom tile grout can you use clorox to clean tile grout to clean and brighten grout and tiles magic touch carpet repair and cleaning your grout is disgusting use this