Hello,
it dosn't really answer my question i wanted/ still
want to know what will i have to do to make it whaite
again.
Believe me, I know what you mean. I spent years dealing with this professionally.
Unfortunately, the problem is that there is nothing you can do.
Your only options are to paint it or leave it alone.
You can clean them, and that may help to minimize it's appearance. But, nothing (except painting them) will ever make the keys shiny and white like they used to be.
There are places on the Internet that sell keyboard decals.
So, you can re-paint the keys if you want, and then re-apply the lettering with the decals.
But, you'll likely be dissatisfied with the results. And, the expense will cost you more than a new keyboard.
Since Apple still sells the Apple Pro keyboard, you may find that to be an option. I they sell for $29.
http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore.woa/wo/1.RSLID?mco=A 354E8D9&nplm=M9034LL%2FA
I have a spare sitting here that's about 6 months old that I'm not using. But, I don't really know what I'd want to do with it. I'm using an ergonomic keyboard at the moment.
I wish I could give you a method to fix it. But, unfortunately I cannot. It's going to come down to a physical fix such as:
1) Painting
2) Replacing the keys with white ones from another keyboard
3) Replacing the entire keyboard
4) Leaving it as it is.
I'm sorry that there isn't another way to resolve this. It's just an unfortunate situation. Believe me, I've been dealing with this a long time in vintage electronics.
In that area, a bit of yellowing can mean the difference of hundreds or thousands of dollars in value. So, I had sufficient motivation to try and find a solution to the problem. Unfortunately, one just does not exist.