I washed my engine bay out today and now tonight when I went out to the car I noticed there's alot of fog in the RHS lens. Nothing on the left. How do I get rid of it? Or just leave it alone and it will clear itself out?

It should clear on its own.

i have the same problem. just make sure the backplate is seal tight.

Well, I went out today and the fog is still there. It's been humid and overcast these last 2 days so it may be there until the sun comes back out and heats everything up. Is this going to be a constant problem?