Salt is amazing for cleaning drains. Plumbers even suggest salt and water or a mixture of other ingredients (salt, water and baking soda for example) to help unclog your drains or improve the flow of your pipes.
Freshen up your garbage disposal by dumping half a cup of salt down the drain. Start the garbage disposal while running cold water. The salt will get rid of odors and dislodge old food and stuck particles.
To create an unclogging mixture simply mix one cup salt, one cup baking soda and half a cup white vinegar. Pour it into the clogged drain and wait ten minutes. Then pour in half a gallon of boiling water. Run the hot water until everything is draining smoothly.