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Hi Adox, toughest test I had was cleaning glass graticules - as they are at the focal plane of an eyepiece. I have two of these (in Intes Russian finders).
Tried everything imaginable but all but one left fluff or visible marks on the graticule.
The only approach that worked was a thorough clean in detergent under running water followed by a rinse of distilled water and a firm shake... after that they dried perfectly clean.
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