15+ Bathroom Sink Draining Slowly Background . If your bathroom sink is draining slowly but the tub and toilet drain normally, there are several possible causes. My bathroom sink isn't draining very well, and it's driving me crazy. 4 Ways To Unclog A Slow Running Bathroom Sink Drain Wikihow from www.wikihow.com Pay attention to your bathroom sink drain as you let run water every morning. In fact, we may make fun of you for wasting your money buying them and possibly risking your well being for using them. Pour boiling water down the drain slowly. He had a bathroom sink that was draining slowly. If your bathroom sink is draining slowly but the tub and toilet drain normally, there are several possible causes. Although the water finally runs out, it takes a long time — and it's hard to use a sink full of dirty water. How do you fix a slow draining bathroom sink? This metho...