After making the initial plunge, the plunger should now be completely sealed around the toilet bowl's drain.

Next, vigourously force the plunger up and down several times, making sure to keep the plunger sealed to the bottom of the toilet bowl.

This method forces water in the drain to push and pull in both directions, eventually loosening the stuck material and unclogging the toilet.

After several thrusts, remove the plunger and repeat steps 5 and 6 until the toilet bowl drain clears.