My Macbook Pro 15" (pre-unibody) was clogged up and it was time

Every 6-9 months I need to take apart this laptop to clear the fan vents of dust buildup which make the thing overheat. It's been 20mn now and through the same level of usage, my computer is running quite a few degrees cooler than it would previously : from ~190-195 back down to ~138-155 and the fans aren't duty-cycled out anymore.

They would run full-speed (5100rpm) but now they're settled at 4000rpm tops

it's not tough to take apart…

running OS-X Mavericks