2 tsp of vinegar and 2 tsp of borax in a spray bottle. Add hot water to dissolve borax. Leave room at top of the bottle so u can add cup yummy smelling dish soap. Fill the rest of the bottle slowly with cold water so u don't get suds.
How to unclog a sink drain without harsh chemicals, and IT WORKS! cup baking soda, cup vinegar, Let it bubble 15 minutes and chase it with a pan of boiling water. Light plunging needed on tough clogs. I'll never buy drain opener again.