A friend of mine gave me an old Super Graphic recently. It had been in his basement for quite some time and had gotten a bit musty. After my experiences with the basement flooding and the mold, this was something I wasn't terribly happy about, but I figured I could do something about the problem and not vaguely ignore it.
I googled some variation of 'clean musty super graphic' and came upon a few pages that recommended wiping it down with [vinegar / dilute vinegar / dilute bleach / Formula 409] and letting it dry for a few days.