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Televue have a page on this topic (that horrified me initially, but they are correct). Most important thing with modern EPs (even cheapies) is not to scratch them by scrubbing bits of dirt against the glass/coating. Blow gently (with a blower, never from your mouth), gently brush, repeat; dab windexed cotton wool, soak up same way (see televue's advice! dab on - dab off - BE GENTLE ffs!). Easy slowly gently does it. Common sense really.
It's easy to get impatient under great skies with dirty optics. If you cannot take your time, it's better to put up with dirty optics on the night than ruin it for good.
Another fave solution is to have a few cheap but alright EPs (e.g., GSO plossls) and clean them the same way you'd clean your corner-store sunnies (exhale and rub with cotton T-shirt - but still BE GENTLE: rub over scrub). Lens pen has been mentioned. I'll only use the business end for cheapie EPs unless the pen is brand new. The brush end is good though.
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