ScumBlaster is the most effective Tub & Tile Cleaner you will ever use. More than a bathroom cleaner, it can be used wherever hard water deposits or soap scum are a problem. Dull surfaces become shiny and squeaky clean. The cleaning power of ScumBlaster is comparable to that of muriatic acid, yet this noncorrosive formulation is environmentally friendly, non-fuming, and safe for septic tanks. ScumBlaster has been formulated using an organic salt that was designed as a safe replacement for traditional acids in industrial applications. Deep cleans grout. Contains no bleach or acids.