I was faced with this dilemma, as my scope had been in storage for about 3 months. Some bugs and a beetle had managed to find their way into the OTA and the primary was filthy. I was advised years ago not to touch the mirror if it was only dusty, but this was serious carp. Anyway, a bit of moisture on a microfibre cloth worked wonders. As far as I can see, there's no damage to the surface and the image is back to normal!
I guess I'm lucky.
|