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I am in the process of restoring a VERY neglected refractor. I cleaned the objective, after removing the dirt and crud with a blower first, with my Windex/acetone/ethanol solution. This cleaned it 95%. I then followed up with reagent grade acetone - just as TV suggest - applied with lens cleaning paper (whilst wearing cotton gloves) and then the entire lot wiped clean with several lens papers. Spotless.
The lens pen is good for UV filters on cameras, and I admit I will use it on finders (I cleaned up a neglected Takahashi 6x30 today with one), but NEVER on an EP, objective or binocular lens. They simply retransfer old oils etc as mentioned previously, and being carbon based, no real way to effectively clean them before a reuse. They DO leave carbonaceous deposits on the surfaces "cleaned" with them - as also mentioned, get a loupe or magnifying glass and have a look - you'll be surprised!
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