It's not fading... It's just dirty and there's no known way to clean effectively and safely.
Just look at my Dirty Cherry keys.Show Image(http://i89.photobucket.com/albums/k221/undarken/G80-3494/rare.jpg)
I am absolutely loving my Rosewill but I have one issue with it. The keycaps absolutely suck. My WASD are already fading really bad. So I was thinking of buying some new caps from Qtan, should I go for white or black and engraved or printed.