Thanks for the reply guys, but I did try Q-tips with isopropyl and that did not work. I am concerned about using anything stronger as I can see small electrical thingamajigs on the mirror. I assume these are the focusing lights?? I just don't want to screw up anything.
Just an fyi, my camera is a Canon EOS-20D for what it's worth and it's much smarter than me!
Thanks!
Dan