Isopryol alcohol 99.99% is best. Do not put it into dish washer.
Rats. Ruined my best suggestion.
@ zwatcher, your chances of getting some iso above 90% are pretty slim unless you know a pharmacist, or have connections to a chemical company. At the risk of improving my chances of skin cancer, there are some f12 based solvents (CRC comes to mind) that will do the job quite nicely and will be evaporated before you are ready to re-assemble. Not cheap, but good for what they do.
Otherwise, iso at the best percentage you can get is next on the list. Try to avoid getting liquid (or gunk) into your various slots, or the CPU carrier. Let dry for a day or two, then good luck. (hint: a soft toothbrush and a small bowl of iso...)