Use drain cleaners only if the sink is draining slowly and not completely ... opening in double sinks or use the basket strainer to seal it. Plunge up and down vigorously for about 20 seconds.

Make sure there’s enough water in the sink to cover the plunger’s cup and create a tight seal before plunging vigorously. Try a drain unblocker: If plunging doesn’t do the trick, the next step is to ...