1- Pour 1/2 cup of baking soda over a drain and 1/2 cup of white distilled vinegar over it. The drain is secured with a stopper. The chemical reaction of the two ingredients will result in foam, producing agitation against the clog.
2- Allow 30 minutes for the mixture to rest in drain. Boil 6 cups of water in a pot over the stove while waiting. If your sink has under-drain plastic piping instead of metal, avoid the boiling water and instead use hot tap water.
3- Taking the stopper off. Then agitate the clog with a plunger. Create a seal from the plunger to the area around the drain, and push the handle several times up and down. Set aside the dipper.
4- Pour the boiling water down the drain carefully or turn the hot water faucet on, and let the water run for a few minutes. If the clog remains repeat the entire process.