Remove rust and destroy 100% of limescale with our most powerful stain-fighting formula ever. Scrubbing Bubbles Power Stain Destroyer Toilet Bowl Disinfectant changes from green to blue as it powers through stains. Apply under the toilet rim and, after 15 minutes, just scrub the bowl, then flush to rinse. Kills 99.9% of viruses and bacteria on hard, non-porous surfaces. Reaches hidden germs and grime under the rim. Application: Toilets; Applicable Material: Hard, Non-Porous Surfaces; Chemical Compound: Hydrochloric Acid; Dirt Types: Hard Water Stains; Limescale; Rust Stains.