How to remove yellow dinge from shell and keys?

[Trent]

Is there a surefire way to remove the yellow dinge from old keyboard covers and keycaps? I have tried bleach but with no success (did nothing). Additionally, I've always wondered, what causes this?

Trent

[webwit]

Check this:
http://retr0bright.wikispaces.com/
http://deskthority.net/viewtopic.php?f=7&t=667

[Trent]

Check this:
http://retr0bright.wikispaces.com/
http://deskthority.net/viewtopic.php?f=7&t=667

I want to harvest your brain for all of the useful information that comes out of it

Thank you very much!