Zud Heavy-Duty Rust Remover Cleanser, 16 oz. is a powerful rust and stain remover designed to tackle tough rust and hard water deposits on a variety of surfaces. This versatile cleanser effectively removes rust and metal stains from sinks, tubs, bathroom bowls, ceramic cookware, stovetops, and tiles. It also works to eliminate rust and corrosion from automobile bumpers and hub caps, making it an essential product for both household and automotive cleaning needs. The formula comes in a convenient 16 oz powder form and is safe for septic systems, ensuring effective cleaning without harming your plumbing. Model Number: 540916-06