Stormin is probably right. Oil and hair. In particular if you have
females with long thick hair. My wife's sink has clogged 3 times in 3
years. Agents do not work, but a snake gets the stuff out every time.
Mostly is in near the sink hole therefore a long snake is not needed.
I have a thin hand held one.
Local hardware stores sell a thin flexible plastic strip with teeth.
About two feet long, it comes two in a package for two bucks. You just
push the strip down the drain (don't even have to remove the drain
stopper first) as far as it'll go, then pull it back up. All the hair
and gunk trapped in the line snags on the teeth and comes right up with
the strip. Repeat once or twice. Get that garbage out of your drainpipe
and it'll work just fine. This is a simpler, faster, and safer option to
try before using drain cleaner products like Drano or Liquid Plumbr.
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