Product review (5 stars): Works Great.
This worked great.  I went "backwards" as moving the dryer was not practical.  I turned the dryer on, setting it to "air" so it was not blowing heat. Went outside and cleaned one 2' section at a time, backing out the brush fully while spinning with drill. I added sections one at a time The blowing air easily pushed out the loose lint and the brush snagged most of it.  Top tip: Always run drill in forward, never reverse, even when pulling the brush out.  The rods are very flexible and easily negotiated a 90 degree bend at the start of the run.