Step 4 · Plunge the Drain
If the drain is still clogged, use a cup plunger. For a double sink, you must seal the other drain opening completely. Use a wet rag or a drain stopper to plug the non-clogged side. If you have a garbage disposal, plunge that side. Run a few inches of water into the sink to allow the plunger to form a seal. Place the cup plunger over the drain and press down firmly to create a tight seal. Vigorously pump the plunger up and down for about 30 seconds. Pull the plunger off quickly to break the seal. The alternating pressure and suction can dislodge the clog.