Just in the process of moving to a new house. My wife noticed the dryer was taking a long time. So I went to clean out the piping (usually a 10-15 minute job at the old house). and could get the dryer vent brush through the turns in the piping. The dryer brush was too flexible and the snake I had too stiff. I finally (after several hours) realized my dust collector had the same size piping as the dryer vent piping. Hooked up the dust collector and used it to pull a thin piece of rope through the pipe, and used the rope to pull the dryer vent brush through. Worked pretty well, and the dust collector pulled a bunch of lint out.
John