Product review (5 stars): This was awesome.
A local company wanted $179.00 to clean my dryer duct.  The duct goes up 4 or 5 feet to the ceiling of my downstairs [floor of the upstairs, natch], then bends 90 degrees to the left . . . then goes about 9 or 10 feet  . . . then bends another 90 degrees to the right . . . and goes about another 10 or 11 feet to the outside.

In case someone else needs their dryer duct cleaned.

Bought this through Amazon. It was 6 bucks cheaper than Lowes or Menards. Bought the 4 extension wands at ****** for 19.99, 7 bucks cheaper than Amazon.

The "system" comes with several items . . . but I used the 4 three foot wands and the brush. Added the 4 three foot extension wands.

Went in from the outside . . . you attach the wands to a drill. Run it clockwise. It practically goes in by itself. Yeah, it's a bit annoying that you do three feet at a time .. . . remove the drill . . . screw on the next wand . . . reattach the drill . . . but the 24 feet and brush went around 2 90 degree bends and with the dryer on the entire time, blasted out a LOT of lint. I mean . . . bet it would have filled well over half a 5 gallon bucket.

The spinning brush practically sucks itself into your duct. There were a few times it hit some resistance . . . maybe an elbow . . . but if you work it in and out a few times ... it gets through.

I was shocked at how much was in there. Could be the area between those elbows hadn't been cleaned since I moved in here in November 1987, and for years before.

To be safe, I went inside and ran it from inside to OUT . . . when I had all 24 feet in . . . I went outside to the vent and there, 3 inches in . . . was the brush. So now I know my duct is 24 feet and 6 inches [brush is about 3 inches].