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I'm surprised you got that advice from Bintel. A brand new mirror should be spotless. There can always be some dust on it, after all, the OTA isn't sealed. But streaks from haphazard cleaning shouldn't be there.
It seems GSO may have a QA issue, but Bintel's response puzzles me most. At the very least they could have offered to clean the mirror for you to be sure there is no other issue there. They do (did?) clean optics as a service, why would they not do this as a matter of course?
Cheers
Steffen.
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