Buy one of those zipper up car bags. I bought one a few years back when I stored my car outside with no garage. It is a huge cover that you drive your car on top of and then zip it shut. Basically an all weather car cover tarp that zips shut. I put several of the big silicon gel packs for moisture absorbtion and a few bars of ivry spring soap in there before I zipped it shut. After winter It is dry as the desert and smeels clean too. No varmits and no rust. Sort of something like this. http://www.autoanything.com/car-covers/20A50302A1.aspx