Dont know if this will help anyone, but I saw this on another page. If you empty out the canister and pull off the clear plastic, there should be like a little round area with a bunch of holes. They said take a metal brush and clean out the holes. I used a toothbrush, but a metal brush would work better most likely. I also cleaned everywhere I could reach with the tooth brush. I am not sure if it was cleaning the holes, though I did get a lot of dirt out, or the actual deep cleaning, but I have way better suction now. Try this and let me know how it worked out for you!
Nick, December 2009