Anything less than fully multicoated optics is a waste of effort to carry into the field, especially if you're in a rainy area. Those will already have coatings on there and you don't want to apply any harsh cleaners such as Windex as it will break down and remove those critical coatings. Use dry toilet paper or anything soft that wont scratch the lens.
As for fogging any quality pair will be sealed and wont fog from the inside. however, I have a $2,000 pair of binos (got 'em for a steal at 1/3 normal price) and they will still fog up on a cold day if you breathe right on them. can't change the basic physics of glass with good quality. Use your objective lens covers and that will cut down on quite a bit of both problems.