Lo-Test is an acidic pre-treatment for cleaning man-made ceramic, porcelain, quarry tile and grout. Lo-Test helps dissolve grease and oil while maintaining an acidic pH which is extremely rare ability in the cleaning industry.. The low pH eliminates scale, mineral deposits and embedded stains. This unique blend of acid tile cleaner is stable with an aggressive degreaser on the acid side of the pH scale. Lo-Test can also be used as a daily maintenance cleaner when diluted 2 oz. per gallon of water.