Yes, I tend to agree...so long as you are careful you will probably find the coatings much tougher than you think. I guess we are probably concerned with what might happen if we tried cleaning a lens or corrector and if was softer than we think...I guess the best thing is to give it a try (on someone elses scope?)
Now cleaning a mirror may be a different case as they don't have the sort of coatings they put on lenses.
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