I'm considering buying a summer vehicle that I would like to store for winter, but I don't have an optimal storage solution. There's no climate-controlled storage facility nearby.
What I do have is a steel carport that can I can fully enclose to block sunlight and precipitation while allowing for minimal airflow. I live in central/western Canada, our winters are cold and dry. Stretches of -40C are not uncommon, and typical temperatures hover around -15C for several months.
Assuming I have taken all the proper steps for preparation and can prevent critters, the only thing I have left to concern myself with is frost build-up on the paint during the early and late parts of the winter season (and sometimes during warm spells). At times, the frost melts faster than it evaporates and leaves spots on the paint. I won't have the opportunity to wash it for months due to freezing temperatures.
Is there anything I can do to either prevent frost with this storage option or prepare the paint in a way that water spots won't damage the finish?