What about flame polishing with a propane torch? People say that works. I haven't tried it myself and if I did I would want to practice on something first.
Anyone here tried it?
That's more for clear plastic ramps to remove the ball track etc, wouldn't have an effect on the yellowing (and the plastic and ink would not survive).
My mistake I thought he was referring to yellowing of ramps. I have never really noticed plastics with artwork on yellowing, only fading? I guess smoke damage as someone suggested could do it.
