A sink that is draining slowly is a very common plumbing problem. Often the pop-up that is used to stop up the sink can collect a lot of hair and debris over time. To get the drain flowing smoothly again the debris needs to be cleaned out. One way to do this is to use the Zip-it, a handy plumbing tool, to clean out the drain. Another option is to remove the pop-up and clean it out. Most pop-ups are held in place with a nut attached to the drain just under the sink and can be unscrewed by hand or with pliers. Once the nut is removed the pop up can be cleaned and then reinstalled.