necro time!
I did a test run today with just the AEK spacebar. I used some 20ml of 12% peroxide and substantially more oxy than what is stated in the recipe (that was more than enough for a spacebar and I ended up throwing away most of the mixture). It was a pretty cloudy day outside, and temperature was below 20c. Nonetheless, the result is really good.
Tomorrow is supposed to be sunny, so both AEK and m0116 will go out in the sun to loose that tan

I guess I will need to protect the Apple's logo with some tape, though.
Edit:
@matt3o any update on how those keycaps stood the test of time?
Edit 2:
A word of warning. You can definitely go overboard when doing this. From another forum:
"This is a process where more isn't better; we are deliberately keeping the peroxide strength on the weaker side, so that the bromine molecules are favoured by the peroxide over the polymer; If you use very strong peroxide or add loads of Oxy, one of the side effects you might see is where the polymer gets attacked and turned to the hydroperoxide, usually by attacking the free butadiene bonds. What you will see is that the plastic takes on a white, ashen-looking "bloom" that unfortunately is permanent. This cannot be fixed and should be avoided."
Well, I found out this the hard way:

Note the top of the AEK case, with lots of different color patches.
After the first session, the result wasn't even across top case parts, so I tried another two times. I didn't check the case against the keys or the bottom case, which in hindsight was very stupid of me. One session was longer than usual as I was away from home, and there might have been some more Oxy than prescribed, but not that much. Also, during first two sessions I didn't wrap everything in foil, so the mixture dried up on the case, which also didn't help. In any case, I will wait for re-yellowing to kick in and see how it will affect the cases.
Here is the AEK against the model M. Top case state is better seen than in the first pic.
