I had the same issue with mine about a year ago. I set up on nice clear summers day only to have rain roll in in the late afternoon and never notice it. Needles to say the optics took a bath. I had water between the lenses. I let it air dry for a couple of day but I would still get condensation building up between the lenses on occasion and I started to get a bit of mold as well.
I fired up the oven to about 100 deg C and left it in the oven for about an hour. Worked a treat, the mold is gone and so has all the moisture and there was no ill effect on the lenses either.
cheers
Sandy
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