Check out my retr0brite result on these yellow keys, here:
http://geekhack.org/showthread.php?19644-Dang...-peroxide-DOES-burn&p=377779&viewfull=1#post377779Almost end of day of day 2. Here is another picture of the current result. The wide keys 0 (zero) and Ctrl were never in the solution, and are the controls. W, P, C, F14, F16 were in the solution for over 24 hours straight. W, P, C are obviously much lighter than the yellow zero key. The grey keys' result is not as obvious, but you can tell F14 and F16 are both losing their previous yellow tint, comparing to the Ctrl key.
The picture below was taken right after I cleaned the keys and put them on to a Filco. WB may not be right on that picture (taken with an iphone), but you can see the C and X keys were lighter for some reason at that time. Comparing to the new picture, W and P have almost caught up with C.
This has been a success. I will keep them in the solution for another day to see how much lighter can they get, and if other keys can be at the same color as the C and X keys.