Got it

Let the mixture sit for 30 to 60 minutes . For a severely slow drain, leave it overnight.

Shove 1 cup of baking soda directly down the drain. Try to get it past the strainer and into the pipe.

Here is the definitive guide to unclogging drains with baking soda. Baking soda (sodium bicarbonate) is a mild alkali. On its own, it’s a gentle abrasive and deodorizer. But the magic happens when you combine it with another pantry staple: white vinegar (acetic acid).