Concrete Stain & Rust Remover safely removes rust, oil, engine, transmission and radiator fluid stains from concrete. A powerful cleaner that quickly penetrates and dissolves stubborn stains. Caution: Concrete Stain & Rust Remover is not intended to be used as a total driveway cleaner but as a follow up to Concrete Brightener for use on stubborn stains. The aggressive chemical action works instantly so treat areas for only a few seconds and neutralize with water immediately to prevent bleaching or whitening. Available in one gallon sizes.