Sonia, is the SS part the exterior/cabinetry? I'm not sure what works to protect it, but intuitively, the same thing that shines it--Liquid Gold--might put a protective oily layer on it that's better than nothing. Plus, of course, a cover--fog and cold dewy night air is going to be your biggest problem.
My wine shopping and I have never had a problem. Just a perpetual race between the bankruptcy court and Hell.--Rogov