>>7387405>The white plastic has obviously aged and undergone some color staining as a result, so now it's a vaguely off-white/yellow blend that looks very off compared to the white paint on the locomotive. Is there anything I can do to brighten this shit up?Yes. Buy a few bottles of this (you can usually find it in a pharmacy) and wait for summer. Get a glass or clear plastic container that's big enough to submerge the piece in, then submerge it in the hydrogen peroxide and leave it in direct sunlight for a couple of hours. Be sure to stir it every few minutes to knock off all the air bubbles that will form on the surface of the pieces. You will want to wear rubber gloves or use a stirring stick because dunking your hand in the liquid will make your skin shrivel a bit.
If possible, disassemble the cars before soaking them, so you can maximize your time.
This will cause the flame-retardant molecules on the surface of the pieces to re-whiten themselves. Eventually they will yellow again in a decade or two. Sunlight might cause fading of the painted pieces, but it shouldn't be too bad.
