Black Diamond Stoneworks’ Ultimate Grout Cleaner is an innovative, labor saving grout and tile cleaner for grease, dirt, oil and soap scum. Why go through the expensive and inconvenient process of having your grout professionally redone when you can make it look like new again? Ultimate Grout Cleaner is quick and easy to use, Acid-free, and will work on all types of white and colored grout. The deep penetrating formula effectively cleans grout with out damaging the grout or thin set. Ultimate Grout Cleaner comes Ready-To-Use or in concentrated form.