Normally garbage disposals are maintenance free. However, if it malfunctions, then you'll have a headache on your hands. So, if you want to keep your disposer maintenance free, you should follow this guideline. Run cold water When grinding, the trick to ensure all the waste goes through the entire drain pipe, use cold water. Then, any fats (normally you shouldn't put any fats in such as meat or greasy stuff) will harden and can be flushed away. ...