If your toilet clogs...
You can typically dislodge a clog using a plunger. Simply press your plunger firmly into place over the drain, which should create a watertight seal. Next, use your hand to rapidly move the plunger up and down. This will create suction in the pipe and push the clog through. You may need to repeat this action many times until the clog drains.
Shower/Sink Clogs
If your shower or sink is clogged, there may be hair or other debris blocking the drain pipe. You may be able to fish out the debris using a small hanger or wire. You can also purchase tools created specifically for this purpose sold at your local hardware store.
Please do not use harsh chemicals to clear your drain, as these could potentially damage your plumbing system.