Hi Pete,
I recently dealt with a bad bout of dew as well, and you would be right in thinking that keeping it in a towel should keep the condensation out. I always found that it gets drenched in the morning/night though, and with no vents you would have to be careful with humidity as that can wreak your optics (from experience).
In terms of drying it off, I would just leave it outside to dry - wiping it down often leaves water stains on your shiny equipment!
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