Product review (5 stars): Worked like a charm
Worked like a charm.  I have about 10 feet of dryer duct, half of it straight rigid, two elbows, then half flexible foil.  This snaked through the curves and quickly scraped off all the thick lint that was on the sides of the duct. I towards my dryer from the outside, so I wouldn't have to move my dryer/washer stack that's in a closet. Used a shopvac with the attachment included in the kit. My plan is to do this once a year to keep things safe and keep the dryer efficient.