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Cut a piece of lemon into individual slices that are small enough to fit into each section of an icecube tray. Fill the ice cube tray with vinegar. The vinegar will help deodorize and sanitize your garbage disposal drain. It will also clean out crevices in your garbage disposal sink. Leave the tray in the freezer overnight and allow all of the ice cubes to harden. Break the ice cubes out of the tray and dump them into your garbage disposal drain. Run cold water over the ice cubes and turn on your garbage disposal. The blades should break up the ice, and the citrus and vinegar should freshen up the smell and clean your drain. Once you're done, run cold water to rinse out the drain. Cold water hardens oils and grease so that the garbage disposal blade can break them up.
Cut a lemon into slices. Put the slices into an icecube tray and top them with vinegar. Allow the ice cubes to harden. Place the ice cubes in your garbage disposal. Turn on your garbage disposal until you break up all the ice.