Before I built a climate controlled garage for the ol' girl, she was in a non-climate controlled garage. Between Thanksgiving and Easter I would just pop her in a CarBag with desiccant packs. She would come out of the bag exactly like she went in. No surface rust, nothing. Other than putting 35 lbs. in each tire, all I ever did was put a bottle of Stabil in her and make sure the
antifreeze is good. If you do that, you'll be fine. Here's a nice thread on the subject and an old pic of my car in a CarBag.
Good winter storage thread:
Proper winter storage
