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James listen to John B's advice, as you know he's very knowledgeable and a highly experienced observer and eyepiece expert.
I just wanted to show you what I do if I have to deal with basic smudges etc that aren't too excessive.
Here's an example I did tonight for you on my Meade ETX 90, (btw I know my secondary is off centre, that's why it was dirt cheap).
I haven't cleaned it in over 5 years and it had a smear right across the corrector.
A few quick wipe-overs with my lens-pen and it's back to that 'show-room' look.
Anyway, good luck with your cleaning.
RB
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