There's nothing worse than having sewage backup through the toilets. It's especially awful when the sewage spills over onto the floor. Then, you have several problems to worry about. You've got the clog to clear, the mess to clean up, and the disinfecting to take care of. If your toilet has backed up, it's important that you avoid making mistakes that could make the problem worse. Here are four tips to help you avoid mistakes when cleaning up after a toilet backup.