Always go for the plunger first. A cup plunger may frequently remove small blockages. It's a basic plunger with a flat rim that provides a seal over the sink drain hole, allowing you to apply the pressure needed to clear the clog. Place the cup over the drain opening and make sure there's enough water in the sink to immerse the plunger's head. Maintain a seal and swiftly plunge up and down, keeping the plunger below the water's surface and barely raising it an inch or so on each upstroke.
If the plunger won’t clear the clog, use boiling water. Remove the boiling water from the burner with care and pour it straight down the drain in a continuous stream. The water should start draining. If it doesn't, wait until the water in the sink has totally cooled before repeating the process.
For a natural approach to unclog your sink, pour one cup of baking soda, followed by one cup of white vinegar, down the drain. Cover the drain opening with a rubber stopper or another sink hole cover. Allow the vinegar and baking soda to unclog your drain for 15 minutes before removing the drain cover.
If none of these tactics work, it’s time to call a plumber for professional clog removal services.