[sdiy] Process to reverse yellowing of old plastic

[Joel B]

> I know most old synths didn´t use the computer style gray plastic. But this method could be useful for keys perhaps and the results are pretty impressive!
> 
> http://retr0bright.wikispaces.com/                          

I noticed the other day that all the keys on my Kawai K5000s (circa 1996) now look horridly yellow, so maybe this would be worth doing. 

Joel