For dampness on the objective I use an old method. Cut out a circle of thick blotting paper and press it into the objective cap (not touching the glass when on). Leave the cap in a warm room while observing, then when coming in for the night put the cap on. That way you get your objective covered and the water is adsorbed by the blotter. Regenerate with a hair dryer or in a warm oven for a while.

__________________
The Devil offered me power. I told him I preferred aperture.