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Still I'm not keen on dragging stuff across the mirror besides the advantages gained from doing the cottonwool drag will be eroded after the first couple of nights out as the next round of crud and dew spots begin to accumulate.
I think leaving it to soak in warm water for an hour or so is adequate to loosen the vast majority of crud. Besides ringsing it with the tap water and the distilled will take care of most of the cling-ons anyway, and those few that happen to remain won't be enough to harm the image.
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