Standard household cleaners often contain harsh chemicals and can be quite expensive. There are other items you may already have in your kitchen that can clean and remove clogs equally as well. Baking soda and vinegar is one example; Pepsi Cola is another example. The phosphoric, carbonic and citric acids within the soda will eat away at the stains and clogs, clearing your drain overnight.
Clear the drain of any obvious debris.
Pour an entire 2-liter bottle of regular Pepsi down the drain. Pour slowly.
Allow the Pepsi to sit overnight in the drain.
Flush the drain with hot water. You may need to repeat the steps for a particularly tough clog.