No, don't wash your keyboard, that might break it. Washi your keyboad, so it looks just lovely, like this one:
As found at Tinkering Times.
Now I have an old Microsoft keyboard at home that I just can't seem to find a replacement for, despite it being the ugliest thing. I just can't type on anything else. The letters are nicely separated and stand proud of the board, which is nicely sloped and so my fingers just feel at home.
I know it's not fashionable. I love mac-style keyboards like the one above and the one on my laptop to look at, but I just love my old one to use. If I keep it long enough, maybe it'll be cool again.
In the mean time, I think it'll have to get the washi treatment!