How do you unclog a Badger 5 InSinkErator? IMPORTANT. Free the clog. Use a plunger or plumber’s helper to free the clog. Fill the sink with four inches (10cm) of water. Fill the sink with four inches (10cm) of water. Clear the garbage disposal of any debris. When the clog is dislodged, run the water and the garbage disposal for a minute or two.