Scrubbing Bubbles Power Stain Remover Toilet Bowl Cleaner changes from green to blue as it powers through stains. Scrubbing Bubbles' most powerful stain-fighting formula removes rust and 100% of limescale. Apply the toilet bowl cleaner under the toilet rim and, let it sit for 15 minutes, then scrub the bowl and flush to rinse. Great cleaning power comes with great fragrance options including this Rainshower scent and Citrus. So, say goodbye to rust and limescale and hello to refreshing fragrances with this non-bleach toilet bowl cleaner. A powerful clean with an ever-so-delightful scent. That’s cleaning reinvented.