Sorry Charles,
I think faster than I type. Finger nail polish remover. Depending on where your short is, I probably wouldn't cover it with nail polish especially if there are other wires near. It can get messy and flake as it gets old. I had a similar problem with my Audi. I got some silicone dessicant(moisture absorber) and packed in the area around the short and put some in fuse box when I wasn't driving it. I don't know if it is available by retail. With my rover during the humid St. Louis summers I just grab a handful and spread them out in my car. It takes awhile to work, but it also seams to get rid of odors associated with moisture ie. bother-in laws dog odor. The brand I use is Sorb-It 1800-989-3374. Avoid alcohols for cleaning electronics, escpecially methanol. It and other alcohols carry a charge and can actually leave a static charge after cleaning.