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Hi
I have found it depends on the stain ,Water based stains just breathe on the lense and wipe with a microfibre cloth ,Oily based stains from fingers and eyelashes i use isoprophyl alchohol and a microfibre cloth but before you use anything always use a blower to remove any specks of dirt etc because if you do not it can damage the coatings on the eyepiece .
Hope this helps
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