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I used Isopropyl Alcohol. I believe the brand was Diggers. It said it contained 100% Isopropanol on the label which from my understanding should be fine. It may be as Don said above in that the alcohol has diluted whatever the original residue was and I've just spread it around the eyepiece. Another cleaning may be in order but I had enough fear doing the first one. I'm terrified of scratching the glass!
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