A slow-draining sink is a universal frustration. Before you reach for a toxic, gel-based chemical cleaner or call an expensive plumber, there is a powerful, safe, and inexpensive solution already in your cupboard: bicarbonate of soda (baking soda).
Pour ½ cup of dry bicarbonate of soda directly into the drain. Try to get it past the drain strainer and into the pipe. sink unblocker bicarbonate soda
Immediately pour 1 cup of white vinegar down the drain. You will hear a vigorous fizzing sound—this is good. A slow-draining sink is a universal frustration