We ask a lot of our bathroom sink drains. We pour toothpaste, soap, shaving cream, makeup and stray hair into them and expect them to work. Unfortunately, sometimes they don’t. A serious clog usually requires a chemical drain cleaner or a plumber’s snake. For a slow-moving drain, you might first try a plunger to dislodge the clog. It’s easy to use; be sure to use it carefully and avoid splashes. Before you begin, put a few inches of water in the sink to provide a good seal around the plunger. Next, stuff a wet rag into the overflow opening of the sink and seal it well. This air block greatly increases the effectiveness of the plunger. Then plunge away! You may have to refill the basin with water a few times to free a very stubborn clog.