Powerful, non-fuming acid rejuvenator grout restorer that makes ceramic tile & grout look like new. Removes hard-water scale, soap scum, grout haze and rust. Floor must be clean of debris and old acrylic floor finish must be removed before product use. (Consult Michco rep for proper products to remove finish from tile floor). Do not use on marble, limestone, and travertine surfaces. Do not use on soft surfaces such as Aluminum and galvanized surfaces as irreversible dames may occur. If contact shoul occur, flush with water immediately. Dilute product between 1:1 for heavy conditions to 1:10 for lighter areas. Apply Mighty Mac Impregnator H2O to non-glazed surfaces immediately once they are clean and dry to assist in maintaining floor appearance. Packaged 2-2.5 gallon containers per case. Read all label instructions before using this product.