To safely clean drains, I pour baking soda into the drain followed by table salt. If the clog isn't bad, I just use cold water to flush it down. If the clog is bad, you will need to use boiling water. Since this will not harm pipes or the environment, you can use this weekly to keep drains from becoming clogged.
I'm with Chris...baking soda and vinegar combination should be the procedure...if still sluggish, (ie,drain line has grease from dishwasher &/or disposal debris, pour 1/2 cup of TSP (Trisodium Phosphate) into drain, followed by 1 gallon of hot water....
What I have used in the past, is you pour about a cup of baking soda in the drain. It will not all go down, but what you do is slowly pour white vinegar down the drain to rinse the baking soda down. When you can see the drain, stop & let it fizz. Wait till it's through fizzing & flush the drain with water. This works really well. I will try yours though.
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