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Tell us the model and specs of you MBP. Some have one others have 2. If it's a unibody MBP, you remove the bottom lid, disconnect the fan(s) cable(s) and unscrew the fan(s). Older unibody Macs have philips 00 screws, newer ones have special screws, but theres a scre driver for that. One the fan is removed, I blow into te heatsink vents, and blow into the fans. If really dusty in the fans, a cotton swab wet with water is used to remove the remainig dust. Sometimes (don't do this) I carefully poor a little water through the heatsink vents while keeping the electronics covered up. This ensures ALL dust is gone.
 
Wouldn't it be easier to use the Paint Brush?

I normally use Paint Brush ($2) make sure it hard strains on (not soft coz they can get thing out)... just brush it gently. I haven't try it on MBP but i done on afew laptop and desktop i have. Also sometime i use Vacumm cleaner to suck the one that hard to get.

Cheers
 
If you unscrew the fans, does the radiator come with it too, leaving the CPU's cores exposed? Or does the radiator stay in place and only the fan comes out?
 
I would do it after 2-3 years of use. It might help with noise levels because the airflow is more efficient and the fans can spin slower. It is not necessary unless your fans are at max all the time.
 
i have only had me macbook for 3 months now. i went to the apple store to have them upgrade my hard drive (which they guy did 😀) and when he cleaned the fan it was surprisingly dusty. im going to start cleaning it every few months now.
 
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