I use carb cleaner.. works great.. It doesen't leave an oily residue ....... It evaporates clean away. This CRC brand Clean-R-Carb I have contains Toulene, Methanol, Acetone, and Xylene, all of which evaporate cleanly.

Yes, it is strong.. The better to penetrate the grease with..

It's not going to dissolve your CPU or anything.

Isopropyl alcohol can be annoying, because it has water in it. Sometimes there's little drips of water left. You can get the 99% isopropyl, for about .25 cents more a bottle, though.
Works great for getting those silly thermal tape pads off new heatsinks, too.