The only way you will know is to check with your insurance company.
However... you do know, that if you get some automatic dishwashing liquid, mix it kind of strong with water in a bucket, and sponge mop the side of your camper, it will remove hard water spots? It works great on glass shower stalls! I've used automatic dishwashing liquid on windows, all kinds of glass, after hard rains, or if in an area (camping) with hard water and white calcium water spots from on the sink or counter tops. Let it soak a couple minutes, and rinse it right off. (Try it?) It works great on dishes!