Blower motor

I have an annoying rattle sound coming from my dash vents. I think its probably a leaf or something since I had the car parked under a tree for a while and alot of leaves fell on it.

I did some searching on here and found it might be something in the blower motor, I was just wondering where this is located and what exactly I'm looking for. Also can I get at this without dissasembling some of the dash?
 
On the passenger side under the dashboard. If you move the seat all the way back, you'll be able to look up in there and see. You may have to cycle the blower a few times from high to low, etc, to get whatever it is to a point where you can get to it (which will require a coat-hangar, or a twig with bubble-gum attached to the end, etc.)