There is no solution. In theory the cameras ought to be cleared by running the A/C, but as far as I know there’s no conduit for air to get to it, I presume it’s more of an internal ambient temperature thing.
The B-pillar cameras have no heating element so they’re at the mercy of the weather conditions.
I had the same problem on mine, and assumed it was a problem, made a service appointment but by the time the ranger came out it had cleared up. He took them off to inspect (there’s a Gore patch that was removed in later builds, and there’s a service bulletin to remove it on earlier cars) but basically said there wasn’t anything more than could be done.