Clogged drains do not develop overnight, but are a result of buildup that occurs over time. When you notice that your bathtub drain is not draining well, your first thought may be to run to the nearest store and purchase a bottle of drain cleaner, or even call a plumber. With hair and soap scum being two of the most common causes of drain problems, it may be possible to remedy the problem without the use of products or a call to the plumber.