If we are looking at fingerprints or other human debris on the glass, I blow with a bulb, then brush with the lenspen brush, then gently use the lens pen. It lifts fingerprints, oil from faces etc. like magic - fast and simple. But yes, if there is a spec of grit on the glass, I expect the outcome of a brisk rub with the business end of a lenspen will not be good.
Anything else, I'd be using an isopropanol-based cleaner.
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