said by Dennis: said by whocares :
After you snake it, run some really hot water down the drain.
I've tried that but hasn't helped.
If it is soap and grease scum then hot water does indeed help, but it needs to be run continuously for a long time. Stopping the hot water just allows the scum to coagulate again. Since you have access to the drain pipe in the basement check at the far end of the pipe and don't turn off the hot water on the sink until the pipe had time to get properly hot (allow for extra time depending how far that scum still has to go down the drain).--
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