Professional strength Drano Commercial Line Dual-Force Foamer has a strong formula that combines two powerful liquids creating a foaming action that deep cleans and clears clogs. The foaming action fills the pipe and thoroughly clears its walls, dissolving gunk. Drano commercial strength drain unblocker liquid also helps clean garbage disposals in kitchen sinks to leave them smelling fresher. After following clog remover treatment instructions, a blast of hot water flushes away what's left of the clog. Tough clogs happen, but with Drano Dual-Force Foamer Clog Remover, you and your drains are unstoppable.