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Hi doug,
I had to clean the mirror on my 10"dob..( I sneezed!)..another good idea is to mark a line the side of the mirror with a black marker so you can replace it in the exact position in the mirror cell..it helps with collimation!!..After I cleaned it, I found a swirly pattern on the mirror when light is shined directly on it, I made some inquires and found that this is a result of oxidization between the aluminum and quartz overcoat..but it does not not affect the image!!!.I tested it a few night's later and all seems well!!...but I agree in knowing when to clean a mirror...enjoy your nice clean views Doug!
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