Hi there. I stored my '74 Fender Mustang Bass in my parents' house for a few years. Despite the fact that it was not kept in a basement, when I picked it up recently, there was mold or mildew all over the body and case, and a little on the rosewood fretboard. The neck and hardware are fine. It does not smell (as fast as I can tell). Luckily, the neck is not warped, and it still plays as well as it ever did. Any recommendations on how to clean the body without ruining whatever finish Fender was using in 1974? It's solid black, no competition stripes. Thanks in advance!