my method is less work and pissed off a few people when I said it was better. You don't have to play bathroom chemist. The noise died down when some other people tried and agreed.
I went to the pet store and bought 2 jugs Urine Rescue, its stronger than 40 vol. peroxide. prior to this I used 40vol from Sallys too. Both work, with the only upside to the Urine Rescue being you can dilute it down to 40vol strength with water, thus giving you more bang for your buck.
Anyway, you line the bottom of a fish tank with foil and lay your stuff in it.
then you dump your peroxide of choice in until you submerge the stuff completely. If you don't take up the entire tank, displace the peroxide with something good. I used a coffee can full of rocks. I have also used bricks wrapped in foil. Dont use anything dirty or the peroxide will fizz and clean it, and cloud the stuff up.
Then you just sit it on your porch in the sunlight. 4-5 hours later you get nice results. If its going to rain that day, you might want to wait, or put a cover over the top. a CLEAR cover. I just use another fish tank on those kind of days
You don't have to mix goop together, work with messy paste, or any of that. Best part is the peroxide is reusable this way. I did a marathon bleaching of 2 computers, some disk drives, an NES, and some other crap.
The peroxides been in the garage for a few months now. It might still be good!
Note : If its not sunny out (Winter!) you CAN just stick a UV lamp over it just the same. Actual sunlight will always yield better results though.
done via the liquid doom approach