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If the dust is caked-on, then I suggest soaking some cotton wool in clean water and with the EP upright, apply it to the surface and let it sit a while (an hour or so? ). Most or all should come away when you remove the cotton.
If you have really stubborn dust, repeat, or if its all come away, then simply wet some more cotton and gently clean as you would a small window.
If you use distilled and / or filtered water, you don't need to worry about secret formulas or incantations.
There's so much carp written about cleaning optical surfaces that it might as well be classed as a religion.
Use clean water. Soft cloth or cotton. Don't scrub.
Err...that doesn't apply to optical mirrors. They're a different ballgame.
If you have somehow got the surface greasy, then a 50:1 mixture of Ammonia to H2o will do just fine. So will a 100:1 mixture of dishwashing liquid.
So will almost any commercial lens cleaner, though without rinsing they tend to leave a small residue.
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