pour about a half cup of baking soda down the drain, and then pour in vinegar until it bubbles up to the top of the drain. I leave that for about 15 minutes, and then pour really hot water (not quite to boiling) down the drain. This will help disinfect the drain and clean it too.
Unblock your drains without pouring harmful pollutants into the water system by pouring down 1 c of salt and 1/2 c of baking soda mixed together, followed by a kettle of boiling water. Can also use baking soda and white vinegar and boiling water. — good