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If you have dew leave the scope open till its dry but tilt it over so the mirror is on its side. This will allow any real excess dew to run off and not pool in the bottom of the mirror curvature. In all honesty though, I have never had it run off as that would be a LOT of water.
To stop dust when the scope is open I use a bit of thin curtain cloth that is well washed. Just drape this over the openings and it allows the water out but not the dust in. No problems so far.
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