Product review (5 stars): Every house needs this to keep the dryer operating lint free, fire free
Every house should have one of these. I cleaned my dryer vent thoroughly and easily with this brush.  My vent is a smooth metal vent 32' long.  It's also runs in a straight line to the end with a 90 degree up to the dryer.  So, I was able to duct tape the 12' brush assembly to my 20' extension pole and rotate the brush all the way along the line.  It worked great.  All I had to do is clean the line from the dryer thru the wall and I was done.  This brush made cleaning the vent so easy and it worked so well.  I was amazed at how much lint was in my vent. I'm so glad I found and bought this tool, I'd buy it again and certainly recommend it highly.