NO talking ASMR | How to retrobright a extremely yellowed Gameboy Advance

I bought those original Game Boy Advance shells on Ebay. The auction was just with photos and you couldn’t really see that there were no motherboards inside them (maybe that is why I didn’t paid that much xD). Still the shells were good + original and the screens were also there.
Frist I disassembled the Game Boy and cleaned everything with some hot water and soap. There were some pretty dirty ones. After drying them I put them into my retrobrighting box. Retrobright is a process where you get the yellow color from the shells. You just need some H2O2 (Hydrogen peroxid) and some UV-lights (and maybe some aluminum foil). It took like 2 days to get rid of the yellow color. Normally if it is just a little bit yellowed it take 1 day.
After all the shells are in good condition and I probably sell them on Ebay for someone that needs a replacement shell.
Thanks for watching!!
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