Ultimate Grout Cleaner is the best grout for tile and grout cleaning, it is an innovational, labor saving cleaner for grease, dirt, oil and soap scum on educator or colored grout. This acid-free formula you with the best way to strip grout and instrumentality, porcelain or marble. It can also be for cleaning grout with a grout steam cleaner. Because it is acid-free it will NOT calcium or water spots from showers but it will work extremely well on the soap deposits. It will not normally marble but we always recommend that you do a test area first-class honours degree. Simply on the grout or tile and let stand for 1-3 minutes. with a brush to loosen enclosed soil. with strip water. This product is very unassailable so do not on piebald surfaces. in the USA.