Scrubbing Bubbles Drop-Ins are just the remedy for yucky toilet stains. Just drop a tablet into your tank to help keep your toilet bowl stain-free up to 4 weeks. With every flush your toilet enjoys glorious relief from stains caused by hard water minerals and limescale. That’s continuous odor protection for a continuous clean. Quick and hassle free! Stain and smell protection that drops right in. That’s cleaning reinvented. Remove toilet tank cover. 2. Tear open pouch. NOTE: Only use one tablet at a time. 3. Flush. Wait until water level is low and bottom valve is closed. 4. Use pouch to drop tablet into corner of tank away from bottom valve opening or toilet mechanism (see package).