Remove rust and destroy 100pct 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 9pct 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