We recommend an enzyme-type drain cleaner, such as Roto-Rooter Pipe Shield®. The natural enzymes eat the grease and hair and keep the pipe from filling with sludge. Used as directed, these products turn the sludge into a liquid that will flow out of the pipes into the main sewer. Pipe Shield's exclusive formula uses natural bacteria to breakdown deposits, so it's safe for the environment. When used as directed each month, build-up can be prevented for up to 30 days. Pipe Shield® is available only from Roto-Rooter locations.