Product review (5 stars): saved me from burning down the house
You would not believe how much junk I got out of my 15 year old dryer vent tubes.  This worked perfectly and with the extension set I easily cleaned the entire length which goes up into the attic and across the house.  I strongly recommend wearing a mask as the stuff that comes out is really fine black dust.  The dryer takes 1/2 the time to dry clothes now.