Heavy Duty Acidic Tile & Grout Cleaner Acidic Stone Cleaner Heavy duty ACIDIC cleaner makes ceramic tile and grout look like new. Powers through hard water deposits, grout haze, efflorescence and soap scum. Features + Benefits: Renews tile & grout Cleans away hard water deposits, grout haze, efflorescence & soap scum Professional strength, acidic formula Where to Use: Ceramic tile, porcelain tile & grout. Masonry & concrete. Directions: Note: Directions may vary depending on size. Always test in a small inconspicuous area to determine ease of use and desired results. Make sure all surfaces to be cleaned are swept or vacuumed to remove loose debris. Heavy duty mixture may darken some surfaces. This acid-based cleaner will etch most marble, limestone and travertine surfaces. Will etch or corrode most metal surfaces. Mask off and protect any metals, baseboards or adjacent areas to avoid splashing, dripping, and overspray onto surfaces not intended to be cleaned. Spray directly onto soiled areas. Agitate with a scrub brush as needed. Remove using a clean wet towel or sponge. Rinse area well with clean water and wipe dry. Thoroughly rinse all metal surfaces with clean water. Clean and rinse towel/brush with water. Reseal cleaned area. Quart Concentrate: 500-2,500 sq. ft. Stonetech