I was going to be "green" and try unclogging our bathroom sink drain with baking soda:
Baking Soda Drain Cleaner
If water hasn’t yet backed up in your drain, pour 1 cup of
baking soda followed by 3 cups of boiling water. The boiling
water will change the chemical composition of baking soda, making it more alkaline. Repeat a few times until the drain is clear.
I've only done it once so far because I realized I didn't have enough baking soda to do it 3 times. Oh well! Has anyone tried this before?
I may have to try it this way:
The Bubbling Method Using Vinegar and Baking Soda
Baking soda and vinegar react with each other to cause bubbles and
fizzing. Sometimes the fizzing can unlodge clogs. Follow the baking soda and boiling water formula, above, with 1 cup of vinegar.