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Sulfuric acid drain opener. It will burn or dissolve all the hair and other bio stuff off in the trap way. Leave it for 10-15 min., plug up the sink, fill with water and let it go. Do it twice and keep water running for 10 min after that to make sure all is flushed away. Works like magic. Use a dish or something to cover up the drain at sink to prevent splash back and be mindful of finishes like chrome or polish metals. Use a funnel and cover it up after pouring 2 -3 cups in there.
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