Its something to think about when making your sets, but I've never found a great solution. Rain-X helps some, but not as much as one would like.
You can at least point your camera away from the great Pacific, but then you have to worry about the rising sun coming up in the East.
Mainly you just learn to live with less than perfect images, like these two of a bobcat who came by the Ghost Deer cam during a single visit.
This Bob has a pretty well endowed tail. We may come back to that at a later date.