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Sulfuric acid drain cleaner of any kind will work. Make sure you run lots of water after 15-20 min of sitting. Some drain may take longer. Immediately it should feel warm and within minutes, the trap way will feel hot. this stuff cleans and burns through anything that's clogging your p trap slowing it down. Every 6-8 months I dump some into all my drains. Soon enough, the tree huggers will outlaw it in CA.
This stuff is a great trap opener.
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