GARBAGE DISPOSAL CLEANER Use this in your disposal or drain when it gets a little stinky. ¼ cup baking soda ¼ cup lemon juice or white vinegar In a glass bowl, stir together the baking soda and the lemon juice or vinegar to make a pasty liquid. The liquid will start fizzing—then quickly pour it down the disposal. Let it sit for at least 5 minutes. Run cold water, then turn on the disposal and run it for 30 seconds.