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Scott
One solution with a fogging finder is to keep the caps on it and only pop them of when you need to. Wiping it is always a rick as the thing you wipe it with needs to be clean and you risk grinding any dirt particles on the lens into the surface.
Best solution is an dew heater strap. On my old 12" I had straps permanently mounted on both objective and eyepiece end of the finder.
Another help is get an old stubby holder and rip the base out of it to make a DIY dew shield, often slightly too big so a couple of heavy duty rubber bands will hold it in place.
Cheers
Malcolm
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