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I guess the best eyepiece cleaning hint is to always keep the eyepieces with covers on them or in little zip lock bags when not in use, so that they don't get very dirty in the first place. It can't be helped with the very narrow eye relief eyepieces, where one's eyelashes will eventually make them somewhat grotty - but at least that isn't gritty, and there is little danger in cleaning them apart from floating dust particles.
My worst eyepiece for cleaning is a 12mm University Optics Konig I bought years ago. It gave superb 60º views, but with such tiny eye relief that it needed cleaning half way through every viewing session. I remember finding it in the grass one day, just as I was about to run my mower over it. I'd accidentally left it outside for four days. Curiously, it didn't need any cleaning.
Regards,
Renato
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