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Hi Trevor,
A lens pen works well for me aslo (for the occassional bad fingerprint).
I use a lense cloth gently from time to time for dusty spots (from when EPs dry out after getting dewy).
For some very old/grubby eyepieces, I used cotton buds dipped in Bintel cleaning for tough spots. If using cotton buds, avoid using too much solution, and soak it up with a fresh buds before it leaves "drying" spots.
Best of all, I started putting the dust caps back on my EPs when not in use ... avoided most dust and foam/lint from getting on the glass in the first place.
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