Baking powder is a good cleaning agent!

I would suggest to use Surf extra rather baking powder.

Products for un-clogging drains are some of the most dangerous ones found in the typical home. You're better off with an ounce of prevention: Use a drain catch or screen to keep hair and food from clogging pipes, and periodically pour boiling water down the drain. If you do get a clog, pour 1/2 - 1 cup of baking soda down the drain, then slowly pour 1/2 - 1 cup of vinegar in after it. Cover the drain and let it sit for 15 minutes. It might bubble like a volcano but that just means it's working. Then flush with a gallon of boiling water. For tougher clogs use a plumber's snake.