Product review (5 stars): Worked like a charm.
Worked like a charm.  I have a 24 foot pipe, so I had to buy the extension set, but as long as you keep the drill going in a clockwise rotation, nothing will come apart.  Go in a few feet, back it out (without changing direction of the drill), back in, add another extension, and repeat.  Took me about 20 minutes to clean 24 feet.