Problem with reversing camera

[The Cruisers]

We have a Swift Kontiki 625 2016. We noticed yesterday that one of the cameras is fine but the other one (reversing) has a very misty image. We’ve cleaned the lens but it makes no difference.
Any thoughts please?
Thanks.

 

[Lenny HB]

Probably got moisture in it try parking so it faces the sun or warm it with a hairdryer.