Scrubbing Bubbles Extra Power Toilet Bowl Cleaner removes tough stains including rust and destroys 100% of limescale. Scrubbing Bubbles most powerful toilet stain-fighting formula against limescale changes from green to blue as it powers through toilet bowl stains. Apply under the toilet rim and leave for 15 minutes. Scrub the bowl and flush to rinse. Done. Its goodbye rust and limescale, hello fresh scent (available in Rainshower and Citrus scents). After cleaning, use Scrubbing Bubbles Fresh Gel Toilet Cleaning Stamp to keep your toilet smelling fresh.