why not disconnect dryer then vacuum out the duct? tape up the hose for better suction?

GREAT idea. In fact we have a great 1-1/2 HP shop vac that we just
replaced the filter on and it really REALLY has some good suction.
Did know if we might have to use something from the top down. I'll
give that a try!

That's a great example of how these groups are great, such a simple
solution and yet it totally eluded me :O)