I'm doing a refurb for a local friend of a blue satin flame solid-shell Artist from a matching '64 kit. Chrome is easily restorable, Zoomatic in good condition with knob affixed, original extended snare wires with metal strap, etc. However, I have no experience cleaning a satin flame finish, and I don't want to inadvertently scratch it any more than it already is. There are already a few minor cracks - nothing alarming, and of course I realize that I'll never get the "blue" back (it's faded to a lavender), but I'd love to get some of the luster back. Is it possible, and what product(s) would you recommend?