If you have a clogged or slow-draining drain pipe, a cup of plain, unsweetened yogurt may help the drain. The enzymes in the yogurt eat away at the sludge in the drain, which may help loosen or unclog any blocks in the drain. Not only is this a simple process, it's also good for the environment, as you are not placing any chemicals into the drain. f this process does not work, however, more invasive measures, such as snaking or chemicals may be necessary. In addition using this method to fix a clogged drain, use this method once every 60 days to help prevent sludge and buildup from forming.
Measure out 1 cup of plain, unsweetened yogurt.
Pour the yogurt down the drain.
Let the yogurt sit in the drain overnight or for five to eight hours.
Pour a gallon of hot water down the drain. If the water drains, the yogurt worked. If the water does not drain, repeat the process up to three times. If the water does not clear after the third time, more invasive measures will be necessary.