Scrubbing Bubbles Extra Power Toilet Bowl Cleaner changes from green to blue as it powers through stains. Our most powerful stain-fighting formula removes rust and 100% of limescale. Apply it on the toilet and, after 15 minutes, just scrub the bowl, then flush to rinse. Great cleaning power comes with great fragrance options. So, say goodbye to rust and limescale and hello to refreshing fragrances. A powerful clean with an ever-so-delightful scent. That's cleaning reinvented.