Well, you could pay lots and lots of money to have a heavy set man with poor fashion sense come, mumble to himself for an hour, and then poor drain-o down the trap and bill you a thousand dollars. Or, you could put a large pot on the stove with water in it, and put a few good sized squirts of dawn dish soap, or your favorite dish soap in the pot. Stir it lightly with a spoon, and heat it to boiling, but don't let it boil over. Take it to your dishwasher, and using pot holders, very slowly pour it inside a little at a time. If it doesn't seem to go down, let it sit for a few minutes, and come back to it. If it still hasn't gone down, follow the instructions in your owner's manual and remove the trap inside, and see if you don't have something caught in there. If that still doesn't fix it... well... then it's time to call your favorite overweight plumber. The dish soap and boiling water remedy works on just about any clog you have though, and should always be tried before a plumber is called, it has saved me many tears when I got my bill!