A plunger should be the first thing you try as it is the easiest and most cost-effective way to clear a blocked drain. If this works, you won’t have to use any chemical solutions or take anything apart. Place the plunger over the drain and add enough water into the sink to cover the rubber cup. Cover the sink’s overflow vent with a cloth to allow suction. Pump the plunger up and down quickly to try dislodge the clog. If the drain isn’t completely blocked, you should then try running hot water down the drain for approximately 10 minutes before using the plunger again. If the clog then remains, please proceed to the following steps.