My garbage disposal stinks

If it's truly horrible, dilute some Clorox or other bleach with water and pour it into the non-running disposal. Let it set for about a half hour. Add some ice cubes and run the disposal with cold water. Afterward, you can run ice cubes with rinds from Oranges or limes ... any citrus will do ... with cold water.

Washing food down the disposal with cold water instead of hot will prevent future disposal stank.