Older figures with yellowing plastic that weren't exposed to direct sunlight or UV light, is usually because of a low quality white plastic that was used. I have never attempted that supposed fix using hydrogen peroxide (which seems kind of bogus to me, since one of the steps is then leaving it in the sun, heh), so I cannot speak to a tried and true fix, other than painting it white.On the topic of yellowing plastic. Does anyone know of a fix for it? I have that EU white Vader from the comic pack. It has been on display, out of direct sunlight and is still yellowing something fierce on the torso.