ALKALINE TILE CLEANER is a non-acid tile and grout cleaner. This concentrated heavy duty cleaner will blast through heavy soil buildup and other deposits while leaving the surface sparkling clean. ALKALINE TILE CLEANER is built to clean tile, grout, walls, neutralize odors and much more. This product is safe for use on natural stone. Note: Saturate surface with ALKALINE TILE CLEANER for 5 to 15 minutes. Rinse surfaces with clean water after the product has been applied for best results.