Product review (5 stars): Super product
This product is fantastic for cleaning dryer vents.  I had a 30 ft run with a booster fan and 2 elbows.  It looked like a totally clogged artery with only about a 1   left open.  This brush wiped it clean filling my shop vac twice with lint.  Could not have been more pleased.  I did have to separate the vent joints in one location to reach the entire length.  It maneuvers around elbows with surprising ease.