I've often used a vacuum with the "hair-like" brush attachment, but don't want a "hair" or "bristle" getting stuck in a fan and seizing it. So just be careful with a lot of light so you can see. Most of the time I use my compressor.
Be careful with compressed air cans especially don't clean a hot component or it can easily crack if the compressed {frozen} liquid spews out. Get the 3-6 sets of cans any use each for about 20-30 seconds and change to the next; while they're cold they useless. And NEVER have the can on its side or tilted too much!!! Do it on an elevated table and NOT on the floor ~ to most.