Nobody has seen quite as many disgusting clogs as Liquid-Plumr Regular Strength Clog Remover. As the original liquid drain opener it s been getting rid of clogs for over 35 years. It really knows how to get rid of clogs clear slow drains and neutralize odors all while being very kind to your pipes. Pour 1/2 bottle (2 cups) slowly down the drain (32oz size) or 1/5 bottle (80oz size). For the toughest clogs pour in entire bottle (32oz size) or 2/5 of the bottle (80oz size). Allow it to work for 15 minutes. In cases of standing water wait until drain is clear. Flush with hot tap water. Repeat if necessary. Stubborn clogs may require additional treatments.