I''ve found 409 to work on any plastic surface. The dirtier it is, the longer you simply need to leave the 409 on it. I've even used 409 on wooden tables that have pen marks (ball point, felt tip, etc) and it pulls up the ink in no time. And although it won't fully deyellow old Mac plastics like Retrobright, it will very so slightly lighten the color (back to the original color) if you leave it on long enough. Again, use it in a dimly lit cool place for best results, then wipe it off (I use old rags -- relatively clean ones, of course).