Place two handfuls of ice cubes and some citrus peelings into the garbage disposal. The ice cubes should fill the disposal drain about half way.
Turn on the cold water and hold the drain stopper loosely over the drain. This allows the water to trickle into the drain while protecting your ice from melting.
Hold the stopper with one hand and turn on the garbage disposal. Once there is no ice bouncing off the bottom of the stopper, remove it from the drain.
Allow the disposal to run until all of the ice is gone. Turn off the disposal and the water.