Disposal doesn't chop food well or drain has an odor. Fill an ice cube tray ½ full of vinegar and ½ full of water. Once the cubes are frozen, put them in the disposal and turn on. Use 2-3 cubes a week for about a ... Disposal drains slowly. Pour 1 cup each of baking soda, salt, and vinegar. Pour baking soda and salt into drain, immediately followed by vinegar. Let sit for approximately 15-20 minutes. ... Disposal does not make any sound when the switch is turned on. The most likely cause is no power to the unit.