I was so busy playing with me new 5D I hadn't noticed there were 3 white globs about the size of a pencil lead on the mirror. I tried a rocket blower to no avail. I had heard the mirrors were very delicate so I took it to Tempe Camera Repair (a local Canon authorized repair center). To my horror he picked up my camera, grabbed some solution, put it on a tissue, scrubbed the spots off and handed it back to me. As soon as my heart rate slowed down I looked at the mirror as found it was perfectly clean and unharmed. I don't recommend this at home, but I guess they are more durable than I thought.
)
