[Cyclopswc]

Various people have various success whitening plastic parts with Hydrogen Peroxide, oxyclean powder and/or bleach. There are too many different recipes to list, so I'll just let you google "Hydrogen Peroxide to whiten plastic" on your own and pick the formula that you think would work. I will say that I've tried one with Hydrogen Peroxide under sunlight, but didn't work for my Prowl. I think the type of plastic used is also very important in the equation, most people I saw that has success are the ones that whiten lego blocks (higher grade plastic, maybe?) Good luck.