As some people may already know, vinegar and baking soda can be used to keep drains from clogging up. It's a simple solution for cleaning out a drain or keeping it from developing a lot of build up in it.
It just involves putting the baking soda in the drain first, then pouring some vinegar in behind it. The combination will create a foam that will surround any build up that's in the drain. Then, just turn the hot water on and let it run down the drain for about a minute, and everything will be rinsed out.