If you ask any plumber what kind of toilet plunger they use, the answer will likely be a force cup. Also called a bellows or accordion plunger, this type of plunger has a rubber bellows that allows more air to be forced into the drain with each stroke. This extra air pressure creates enough force to break through clogs.
Most homeowners don't need anything more than a simple force cup plunger to keep their drains clear. However, if you have a particularly stubborn clog, you may need to try a different type of plunger. A plumbers' snake is a long, flexible rod that can be inserted into the drain to physically break up the clog. If all else fails, you may need to call in a professional to hydrojet your drains, which uses high-pressure water to blast through even the toughest clogs.