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The best way to test it will be to "write" on a window with a clean cloth; if it's down to nucleation this should prevent it... who's up for doing the experiment to find out the answer?
Actually, it is because of nucleation. When a gas condenses it need a place to start. Like snow flakes water must have something of a different state, usually a solid, to begin its transformation from a gas to a liquid. It is an absolute must to have a dry speck of dust on which to form.