He used hydrogen peroxide (H2O2) in the following way:
- 30% H2O2, water added to lower concentration to 20%
- Plastic container with lid.
- Protective gloves and glasses (always use this when working with H2O2!)
- Tongs to retrieve the Amiga part after bleaching
- His yellowed floppy cover:
He left it sitting in the sun on his balcony for 72 hours.
http://classic-computers.org.nz/blog/20 ... -cases.htm
http://www.atariage.com/forums/index.ph ... pic=138244