Once your waste and water goes down the drain, you don’t really expect to see it again, but sometimes a major blockage in your main sewage line could cause your waste product to travel the wrong direction through the pipe. Of course, this is something that you want to avoid at any cost, especially considering that contact with contaminated water can cause a wide range of serious diseases. So what can you do if there is a clog in your main sewage line since the pipe usually goes underground once it leaves your home? This is where your sewer cleanout comes into play. A sewer cleanout is a pipe that connects to your sewage line which you can open to gain access. Usually you will find this either outside or inside your home near a downstairs bathroom. From this access point the drain line can be snaked and hopefully remove the blockage.