Want tips on cleaning up keyboard keys/mouse rollers

[FS]

My last keyboard is covered in a disgusting brown layer of accumulated hand filth and body grease... at least I HOPE that's what it is. Point is, I've read that keyboards are among the most filth-infested objects we interact with in daily life save for maybe money, and my new keyboard is starting to show the earliest signs of crud growing on the keys.

Does anyone know of an effective way of cleaning your keyboard? I'd prefer not to have to take it apart, by the way.

And while we're at it, any handy tips on cleaning the rollers in your mouse? The best way I've managed to keep them clean is just taking out the ball and scratching off the dust caking the rollers with my fingernails.