Restoring Sega dreamcast controller for my restored Dreamcast Retro Console Restoration

Restoration of badly a yellowed Sega dreamcast controller and VMU for the extremely yellowed Dreamcast console I restored earlier. Like the console this unit also has only cosmetic defects. There are some glue reside from stickers and the yellowing is pretty bad. Unlike many other consoles, the Dreamcast plugs memorycards to the controller. They have many other uses also. These same ports can also be used to attach a rumble pack and probably some other accessories as well. I took the controller and VMU (memory card) apart and there was some dust etc. inside but otherwise it looked fine. However I had an issue of some of the yellowed parts containing metal pieces that would be ruined if I sunk them in hydrogen peroxide. I found that the de-yellowing process also works in only sunlight, but it is painfully slow. In addition I don't have many hours of sun outside in december. So I decided to try my UV-light system only on the parts. Why I didn't put all the parts in. Even though the parts a