How to Unclog a Drain with a Plunger
Push the plunger up and down without breaking the seal.
Push the plunger down until it touches the drain and then pull up sharply, but not enough to break the suction. Repeat this a couple of times.
Warning: If you used bleach or other chemicals on the clog first, don’t plunge the drain without wearing safety glasses. Preferably, flush the chemicals out of the pipes. Even if it trickles away slowly, that’s better than risking splashing chemicals everywhere.