ScumBlaster Tub and Tile Cleaner. This product has been formulated with the latest technology to provide the highest renovation performance without the dangers or health risks associated with conventional cleaners. ScumBlaster Tub and Tile Cleaner is as a safe replacement for Hydrochloric Acid and Muratic Acid. The penetration power of ScumBlaster Tub and Tile Cleaner is unsurpassed in deeply penetrating the grout and tile pores to safely clean the toughest grime, scum deposits and stains. Eliminates mold and mildew, soap scum and hard water deposits. This effective penetration action works safely on most surfaces, including shower surfaces, tile, grout, fiberglass, chrome, plastic, glass, rubber porcelain, vinyl, painted and unpainted wood surfaces. Not recommended for use on marble. Contains no bleach or phosphates, is non-abrasive, safe for septic systems, works in well water and is biodegradable.