Let it sit. This is the hardest part. Give it at least 15 minutes, though 30 is better. Let the chemistry do the scrubbing.
If the water still refuses to run, do not repeat the process indefinitely. At that point, the chemistry experiment is over, and it is time for the plumber’s snake. But for the slow-draining afternoon sink, the fizz is often enough to set things right again. clogged drain baking soda
Start with a kettle of boiling water. If your pipes are plastic (PVC), let the water cool slightly after boiling so you don't melt the joints; hot tap water is often safer, but near-boiling works for metal pipes. Pour it down the drain to loosen the sludge and melt any fat deposits. Let it sit
Before you reach for the nuclear option—a bottle of thick, corrosive chemical drain opener that smells like a chemistry accident—consider the humble box of baking soda. It is the gentle warrior of the household, sitting quietly in the pantry, waiting for its moment. Let the chemistry do the scrubbing
Keep a box of baking soda under your sink. It’s not just for baking—it’s your drain’s best friend.
Follow the soda immediately with ½ cup of white vinegar. You will hear it—a hiss, a crackle, like a soda can opened in a library. Quickly, while the reaction is active, cover the drain with a drain plug or a wet rag. You want that expanding foam to go down , pushing against the clog, not up into your sink.