I heard some chemical reaction helps to remove the tanning of the plastic.
I hope the guru out there will help this guy out.
You're probably referring to the "retr0brite" process. That's probably not needed here (for reasons posted above, and because the keyboard isn't really old enough to have yellowed even if it were prone to that). Nevertheless, it's useful to use on any yellowed plastics.
I've had to clean some IBM 'boards in the past. I'm too lazy to co out, find a dollar store, and buy denture tablets, so I just used soap and warm water. I put the keycaps in a pot, and stirred everytime I went past for about a day. Then, I pulled them off, and dried each one. Any dirt just came off during this process.
If it's easy for you to get denture tablets, etc. You might want to try that, though.