I know how you can get rid of the fogging, but you have to take it off the vehicle. Once off put it in a bag of uncooked white rice inside a sealed container, it will extract the water, once dried, find out how the moisture got inside and seal it or alternatively send it back to the supplier for a refund, or replacement.
Some how I have condensation over the lens of my Dometic "Perfect View" rear vision camera. Any thoughts on how to clear it out?