Have managed to scored a few PC-Engines, Core Grafx and Core Grafx II systems, the white PC-Engines were very yellowed so i used some 35% strength hydroperoxide mixed with water in a washing up bowl to bring back the white goodness!!..... Before... And after 48hrs after..... Thats quiet a transfomation!! Now the thing was the last few days there hasnt been a massive amount of direct sunshine, and its been very overcast, so it would appear that this method doesnt really need to have the sun to work just basic daylight UV! While this method works excellent with white coloured systems, what would it do to the grey shell of the Core Grafx based systems??, as some of them appeared to be stained slightly. Would putting these grey shells in to the hydroperoxide mix de-colour the grey shell, as with the white shells not only did it bring the white back but it also removed stains on the shell as well??