All I gotta do is get some gel for bleaching hair from Sally with 20% hydrogen peroxide in it, put that crap on the yellowed parts, and let them sit out in the sun supposedly and it'll work like magic to make it white again.
I have a MISB VF-1A that hasn't yellowed since I don't allow the sun to shine on it at all. Just the one I took out of the box has yellowing on it. MISB one only set me back $25 shipped