If your kitchen is smelling less than fresh, your sink or garbage disposal could be to blame. Cut kitchen sink stink with one of several natural cleaning methods. One of the simplest ways is to pour hot vinegar down the drain to neutralize the odor. Or, take the cleaning power up a notch by combining baking soda, vinegar, and boiling water. If you have a garbage disposal, try swirling chopped lemon rinds and ice cubes down the drain to get rid of funky sink smell, and repeat this cleaning trick about once a month.