Retr0bright is a public domain chemical mixture used to remove yellowing from ABS plastic computer and electronics cases, including computers that were manufactured by Commodore, Apple, and Amiga in the 1980s and 1990s, and various video game consoles and cartridges. Yellowing is caused by both bromine and exposure to UV light. Bromine is added to ABS plastic, acting as a fire retardant. Retr0bright is hydrogen peroxide, a small amount of an 'active oxygen' laundry booster TAED as a catalyst, and a UV lamp. Sunlight can be used instead of a UV lamp.
Contributions by Cody666, Electron9, and Dah31.