Retrobrite

[whiteb]

The keys I removed individually and put then in a glass jar, added some tap water to the mix and left out in sun.  Took longer to whiten-probably because the mixture was diluted.  Also came out "as new white".

Really simple, cheap ( $5 for 200 ml of peroxide 12%, $10 for 1 litre, and $5 for 1 litre of oxy washing powder, far more than you'll need), and EFFECTIVE.  Kudos to the folks at EAB.

Also did it to a SNES I had, worked a treat.

With the keys, do you have a problem with the Letter maskings coming off ?, or being bleached ?

[whiteb]

If you need stronger peroxide get a 5% and boil it down, peroxide boils higher than water so teh water will boil out. Be careful though.

To be perfectly honest, I would not feel comfortable with trying to self concentrate peroxide on the cooker.., That stuff can be.... "Explosive", which is probably an under estimate of the result.

It can corrode skin (Think acid) in higher purities.  The Nazi's experimented with strong Hydrogen peroxide as a way of killing (Jews).

[whiteb]

Sunlight and the oxy seem to be the vital ingredients.

Yes, from the EAB thread....

UV light (component of sunlight) breaks down the bromine bonds, and Oxy to make the environment *EXTREMELY* hungry for oxygen.  Thus accelerating the process.  or thats how i understood it.