Product review (4 stars): Great for cleaning dryer duct
Used this to clean out my dryer duct.  It amazed me the stuff this pulled out.  If your duct work has a lot of bends work slowly and make sure to tape all the joints to avoid the segments separating and having to tear the ducts apart to retrieve the disconnected pieces.  Overall I am happy with the job it did and it is a much cheaper alternative then paying 100's of dollars to a company to do the same thing.