If you have a garbage disposal, you can keep it smelling fresh with citrus peels. You can go one step more by sharpening the blades at the same time! How? Fill an ice cube tray with lemon or orange peels or both. Cover with white vinegar. Freeze. Once a week throw a few cubes in the disposal and run! The vinegar disinfects, the citrus kills odors and the cubes keep the blades sharp.