Homemade Drain Cleaner Without Toxic Chemicals

Here are a few simple ingredients to clean drains without standard drain cleaners that contain several toxic and harmful chemicals:

Baking soda
vinegar
boiling water

1/4 cup baking soda
1/2 cup vinegar

1. Pour 1 cup of baking soda down the clogged drain.
2. Pour 2 cups of boiling water into the drain. Wait a few minutes.
3. pour another cup baking soda down the drain then add 1 cup of white vinegar and plug the drain immediately.  
4. When the bubbles have passed, pour the remaining boiling water down the drain.

2. Pour the vinegar down the clogged drain.


via:
Homemade drain cleaner [Greenlivingideas.com]
Homemade Drain Cleaner And Declogger Recipe [Food.com]
Homemade Drain Cleaner [About.com]