Keyboards are brittle sunsa-bitches usually...
What's wrong with it? If it's got something inside it (probably of the sticky variety) then you want something that definitely won't scratch the layer of plastic that has conductive sort of "paint" if you will, that connects all the keys when they are pressed ultimately generating the function of keys on the keyboard. Very important you don't disrupt the conductivity of the stripes as a whole, of else. Well... I'm sure you can imagine how poorly the keys will work when they're not connected to the rest of the system.
This is something I've done in the past, so there's no sense in two people making the same mistake.
I would think that rubbing alcohol (or some other suitable solvent) be used with a really really fine clothe. The least course the clothe, and the less friction generated against the plastic layer, the better. I typically find it easier to simply buy another keyboard, unless you invested in a nice one. Mice, I may be able to fix them, if the laser still functions and it's not a broken chip it be easy to fix (crossed fingers), but keyboards I don't have as much luck with.
and of course as you already know clean everything that connects a circuit.
"George Bush says he speaks to god every day, and christians love him for it. If George Bush said he spoke to god through his hair dryer, they would think he was mad. I fail to see how the addition of a hair dryer makes it any more absurd."