I've washed several keyboards in the sink before. You can get them totally wet, give them a bit of a scrub with a toothbrush if necessary, but need to dry them thoroughly. I'll leave mine over a vent for a few days and give them a few rotations/shakes out.
For the case, open it up and blast with compressed air. If you choose to vacuum, be aware this can create static and could fry components. I've never had an issue though. Just careful where you stick it. If you blow air at fans, DO NOT spin them fast. This can easily damage bearings by spinning much faster than they were designed. So hold the fan blade and give it a good spray of air.
For the monitor a damp cloth usually does the trick, wipe it dry with a glasses cloth. Though you can get special sprays/wipes.
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