I finally had a chance to try out the "peroxide/vanish" miracle cure for removing yellowing on toys. The reason for using Vanish Oxi Action is because it contains Tetra Acetyl Ethylene Diamine, which supposedly acts as a booster, and makes the process work just as fine with more watered down Hydrogen Peroxide solutions. I got a junker Ultra Magnus in a lot the other day, heavily yellowed and worn: I've removed his right arm and leg, to experiment on As you can see, everything is really, really yellowed: I could only get a bottle of 3% Hydrogen Peroxide (H2O2). The pharmacies here in Sweden have up to 30% H2O2 solutions, but they're illegal to sell for some reason the clerk wouldn't explain to me... It should still do the trick, but it will take a while longer. As I had quite a few parts to experiment on, I used about 100 ml of the H2O2 solution, and a teaspoon of Vanish. The mix is baking in the sun out on the balcony, and I'll keep you updated!