As a short term fix, heat will work, but all you are really doing is forcing the water droplets (condensation) to revert back to water vapor (humid air). If that humid air gets ventilated out and replaced with drier air, then fine - but only temporarily. As soon as humid air Re-enters the space behind the camera window and the glass is cold enough, then humidity will condense on the glass.Has anyone tried the brute force method? I.e. use a blow dryer on it for a few minutes? If it’s trapped humidity, that should evaporate it and hopefully draw out the moisture so that it won’t reappear. Thoughts?
Four approaches (or combinations) might work. 1) Completely seal the camera to the glass so no moisture can get in. 2) Coat the glass with a nano-coating that discourages formation of condensation. 3) Provide forced ventilation. 4) Some means of heating. Possibly by a passive coating or some form of heated element.
Without some very specific designed solution, I don't see this problem going away. Potentially it effects all owners as far as I can tell and if those cameras are to form part of a safety related driving system then they need to be dependable.