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I have a roll of surgical grade cotton wool that's set aside for mirror and lense cleaning. For an eyepiece, I make three small tear drop shaped pieces of cotton wool and use them as follows:
1. Use a blower brush to remove all foreign particles from the lense
2. Put 1-2 drops of pure isopropyl alcohol (not rubbing alcohol) onto the blunt end of the first tear drop of cotton wool
3. Immediately gently clean the lense with that piece of cotton wool. Hold the cotton wool by the pointy end of the tear drop, clean with the round end of the tear drop.
4. Use the second piece of cotton wool to gently dry the lense
5. Breathe on the lense to deposit a small film of distilled water onto it
6. Use the third piece of cotton wool to clean the film of distilled water from the lense.
Never re-use a piece of cotton wool. You can get pure isopropyl alcohol from most sign writing suppliers very cheaply. Alternatively, some chemists may sell it to you for a whole lot more.
That's it.
Dean
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