The garbage disposal machine is very popular in American homes: over 50% of all homes in the USA have a garbage disposal system installed. One of the main reasons Garbage Disposals get clogged, or stop working properly is because of everything that goes inside. Just because you have the best garbage disposal unit that does not mean you can throw everything into it. To maintain and keep your garbage disposal working, here is a good list of things you should not throw in your garbage disposal.