I had this problem awhile ago, none of the uncloggers, vinegar, etc worked. I tried snaking it out but there was a section of the pipe that came to a T and the snake would only go up, the clog was down. Under that T there was an inspection hole where the drain pipe leads to the main line. Pulled out the inspection plug, rammed a garden hose down to get out the big clog, turned on hot water to the hose (from the washer hookup) and then sprayed the whole thing out while pulling the hose back up out of the hole. There was some nasty stuff in that pipe.
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