Dan spent over 2.5 hours working away under the sink and in the basement with his auger, with seemingly no success. Then, essentially after he and I had given up hope of fixing the problem with the auger, the tip of which bent during the process, and after declaring that the auger had not worked and the situation was the same as before, we ran some hot water into the sink and all of a sudden the clog gave way and the problem was solved. At all times Dan was patient and polite and was careful not to allow any of the black gunk from the drain to get onto surrounding areas. I have used Knight Plumbing on quite a few occasions and would not hesitate to call them back for any plumbing work.