This is an incidental cleaner; I mean only use this for hard to remove stains or a few times in the life of the floor. I mention this because the "cleaner" slowly dissolves the grout minerals and if used to often will remove the grout entirely. For daily cleaning use a pH neutral liquid cleaner; and also avoid daily use of vinegar or bleach solutions. Sulfamic Acid comes in a dry crystal that needs to be added to hot water. Follow the manufacturers directions. You may want to use a stronger solution (less water) for tough stains.