I feel the pain... check out this similar situation.
Starts off my bike is kept in a shed that had nuts showing up, birdseed being eaten, and rags shredded. So I thought I had a squirrel too.
One day I pulled the CR out for a ride around my backyard track, and decided to do the right thing and put a clean airfilter in, since I hadn;t changed it from the last mx race I ran. Low and behold, when I pulled the seat off, all those rags, birdseed and nuts are in the airbox. Furious I started throwing the shredded mess into the trash can when I noticed a hole was eatin in the filter itself right on tip. Now I'm pissed, and pulled the rest of the juck out, which included the wad really covering the filter. I found myself looking into the eyes of a scared/pissed mouse with four baibies hanging off her. It was sick, little bald babies and all. Now I wanted revenge, and grabbed a can of Brake Kleen and began to spray, I think the results are that of a chemical attack to Iraqi's.
Needless to say, I had to drop the sub-frame and clean to whole mess out, luckely nothing went into the carb. Imagine if I had not decided to do the right thing, my engine would have been a disasster.
Mine only cost me $25 for another filter, but I still feel the pain!
Stan