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I use a 'Lenspen' for the EPs and 99% alcohol rinsed with distilled and filtered water for telescope optics. I apply the alcohol to a microfibre lens cloth first as this eliminates any possible capillary action around the cell.
Leon is perfectly right. Coatings on EPs and lenses are pretty tough and should be able to take a careful cleaning now and then.
Just don't use a Scotchbrite.
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