I tried the "Bio" cleaners too and actually thought they were working.
I used them before I had a problem, brand new home. But then one day
the drain got slow and slower and slower over the course of about 18
months, and I was still using the Bio cleaner monthly.
The vinegar and baking soda opened it up like new after two over night
applications. I now just pour vinegar in the drain and let sit over
night each month.
I can attest to the vinegar. Cleared out a bathroom sink my wife had
clogged with hair. Using a drain cleaner didn't do it.
BTW, I've read that combining baking soda (alkaline) with the vinegar
(acid) adds a little turbulence but also neutralizes the acid in the
vinegar. But others swear it works.
That is what I used, baking soda. I pour in vinegar, pour in baking
soda, pour in more baking soda and shut the drain. Next morning I
flushed hot water. Opened it right up doing this two nights in a row.
What the heck are they putting in tooth paste these days. That is all
that has gone down a 2 year old drain. Nothing helped until I used
vinegar and baking soda.
This combination worked in about 1 hour on a disposal with sweet potato
skins too. That took two applications also.
I have found that a cup of TIDE laundry soap in the drain works as well
as anything. Add the soap and let it set as long as possible, then
flush it out.
Laundry soaps are designed to dissolve oils and proteins from human
skin. Usually that is what clogs a drain. Especially the big ones.
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