There are several ways to unclog a drain, including natural and chemical methods. Here are some options:

1. Baking soda and vinegar: Pour a cup of baking soda and a cup of water/vinegar solution down the drain, cover with a drain plug, and wait 5-10 minutes. Then, pour boiling water down the drain again.

2. Boiling water: Pour a pot of boiling water down the drain to help loosen the clog.

3. Wire hanger: Straighten a wire hanger and use it to break up the clog. Be careful not to push the clog deeper into the pipe.

4. Plunger: Use a plunger to create suction and push the clog through the pipe.

5. Drain snake: Use a drain snake to break up and remove the clog.

Its important to note that there are certain things you should not pour down the drain, such as grease, oil, coffee grounds, and eggshells. These items can contribute to clogs and damage your pipes.