The process I did was pretty much like what they described. I ended up getting Hydrogen Peroxide from a Sally's Beauty (40 VOL).
-200ml Hydrogen Peroxide
-1 & 1/2 Tablespoons of Corn Starch
-1/4 teaspoon of Oxy clean
Mixed the Hydrogen Peroxide and corn starch in a plastic container, then popped it in the microwave for 30 seconds, stirred, 30 more seconds, stirred, then about 15 more seconds. At this point the mixture became a gel. I let it sit for a few minutes to cool, then added the Oxy clean.
I used a paint brush to apply the gel to the yellowed parts. I put it all on a double thick piece of card board and suspended 4 UV 12" lights from my computer over the area. I made a 'fixture' out of cardboard and aluminum foil to redirect the light towards the parts. I let it all sit in my basement for around 24 hours under the UV lights. It never really foamed up like the retr0 bright wiki says it should (probably because of the different ingredients).
Here are some before and after pics:
Originally what the unit looked like (got this pic from Ebay listing):

Here's the parts laid out:

IFU before:

Here you can see the original color vs the stained:

After!:

Here you can see on the back of the IFU where the gel dripped down (if you look real hard):

Overall, I'm very happy with the outcome and now have a pure white CD Unit and IFU. Not to mention I saved this one from the dumpster, since I bought it knowing full well that it was broken. Ended up being a dead laser unit.