Soft Scrub Duo-Cubes in-tank automatic toilet cleaner helps fight toilet ring, hard water, and limescale stains. Soft Scrub Duo-Cubes are easy to use and safe for toilet components. Just drop a Soft Scrub Duo-Cube in the tank and enjoy cleaning and freshening benefits for up to four weeks! This package contains 2 Duo-Cubes in Soft Scrub's Alpine Fresh scent for a total of 8 weeks of cleaning. Directions: 1. For best results, clean toilet bowl thoroughly. 2. Take cube out of package. Do not remove protective wrap on cube (it is water soluble). 3. Remove lid from toilet tank and flush. When water is low, drop cube in tank near side wall away from water valve opening on bottom. 4. Wait 10 minutes before flushing again. Note: Once the water is no longer blue, cube is gone. *Each cube lasts up to 4 weeks.