Thrift is highly effective on grease, hair, and soap scum. A teaspoon per month of thrift in bathroom sink and tub drains will virtually eliminate slow drains caused by hair and soap scum - the two biggest culprits of slow drains. Simply let hot water run down the drain, drop in a teaspoon of Thrift Drain Cleaner and you'll see almost instant results! Try Thrift, it works.