Heck... our trucks have been having infestations just here in the driveway... we've had mouse nests in our glove box... and I think they're in the vents. Ugh.
Might have to fly you out here to show us how to take that stuff apart.
Heh, when SirKit went to crank up Gimli early last Spring, he found that some critter had been chewing on the wires. We had to replace some parts. We know it was a critter because it left some hairs behind. We're thinking it was a racoon or a fat squirrel, by the length of the hair.