One of the easiest things you can do to clear a slow-draining bathroom sink is to mix half a cup of baking soda and half a cup of white vinegar, pour it down the drain and let it sit for a few minutes. Then, flush with a couple of quarts of hot water. Follow these steps over the next few days to fully clear the drain. However, if your obstruction isn’t moving after a long time, we advise you to consult a professional plumber from Strittmatter.