Product review (5 stars): Amazing... Exactly what I needed
Using this device, I was able to dig out enough lint in my 18' of rigid dryer vent to full a 5 gallon bucket. I don't know how well it would work on aluminum or plastic flexible pipe but it worked PERFECTLY on the galvanized rigid ducting I have in my home.
I started 1 section at a time and cleard the pipe from the exterior vent cover on the side of my house and worked back toward my dryer. It did not work around 90 degree bends for me so you will need to come at it from the other end if you have a sharp bend in your ducting. Once each section was clear (about 3 feet at a time), I added the next extension and cleaned the next section. It's important to take it slow, completely remove the rotary brush from the vent to extract the lint frequently, and ALWAYS turn the brush in the correct direction. Reversing the direction of the drill may cause the sections to unthread and detach.
This tool did an amazing job and is very well built. I used a power drill with a 3/8 inch chuck. This saved me hours of work, makes my clothes dry 3 times faster, completely removed the buildup of humidity on my laundry room during the drying cycle, and possible saved my house from a fire.
Well worth the money, cheap insurance, and will pay for itself in energy savings in less than a year.