In a large measuring cup or bowl, combine one cup of distilled white vinegar and one cup of boiling water. Pour one-half cup of baking soda down the drain followed by the vinegar and hot water mixture. Cover the sink drain with the drain plug and allow the mixture to work for 10 minutes.

Pour 1/2 cup baking soda, followed by 1/2 cup vinegar down drain. Plug drain, and let sit for one hour. Then, pour a pot of boiling water down drain. Repeat if necessary. Lemons are a natural disinfectant, stain remover and are wonderful for polishing metal. Also, lemons are inexpensive and eco-friendly.

Pour 1/2 cup of vinegar into the drain. Cover the drain with a stopper, if available, and let the mixture work for 10 minutes. The baking soda and vinegar will fizz and bubble a lot; covering the drain forces the reaction downward instead of up and out of the drain, but it's not critical that you cover the drain.