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Moving aside from the infectious diseases sub-thread for a moment, I have found that the safest and best way to clean my eyepieces is to use the cloth you get from optometrists to clean your eye glasses. An occasional wipe is all that I have found necessary.
It is advisable to use a "blower" to remove any major items of dust and grit first of course, or any cloth, including an eye glass cloth, will pick up the grit, and continued movement will scratch the EP.
My concern about using anything wet is that fluid can leak around the edges of the glass inside the EP itself. To state what is probably obvious, you should never put fluid directly onto the glass itself.
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