IMO: stick with a microfiber, dry. I think someone mentioned using a "fresh" microfiber, but I would wash it first (and only microfibers by themselves, no fabric softener whatsoever, and no dryer; air-dry).
IF** removing the dust is not good enough, then I would go towards either distilled water and/or the highest % of isopropyl you can get. Only very lightly damped.
I've also used an automotive type of electrostatic brush. It works well, I think.
Do not over-clean. The best is to not use any chemicals or water at all, unless absolutely necessary. Well, this is what I know about cleaning PJ lenses. (I once received bad advice here about cleaning my PJ lens, and I won't mention names; I'll just say I've never once followed his advice since.) Hence, don't go overkill, and just dust for now, as that is usually the only thing that happens (outside of kids).