Use Plunger or wire hanger
Remove the strainer or stopper from the drain and fill the basin halfway with water. Start plunging, gradually increasing the pressure to remove the clog. If it’s not working, try to use wire hanger.Straighten the wire coat hanger and keep pushing the hanger in and out until the clog breaks up.
Baking soda and vinegar
To unclog the drain, slowly pour a pot of boiling water down the drain, keep almost one cup for later. Next, add the water with half a cup of baking soda and wait for 5 minutes. Follow by pouring a cup of vinegar and let sit for 20 minutes. If it’s still remains unclogged, add baking soda and vinegar with hot water may help. Because vinegar is an acid and this create pressure with baking soda that may dislodge the clog.