Odor-causing bacteria can live in your kitchen sink and drain. More can grow from garbage disposal scraps. Do this once a week to clean: Put 6 ice cubes, 1 tablespoon of baking soda, 3 thin lemon slices, and 1 teaspoon of bleach into the disposal. Add 6 more ice cubes and turn it on. When the grinding stops, run cold water for 30 seconds. The ice helps knock food particles loose. Bleach kills bacteria, and lemon slices help with odor.