Cleaning the dirt from fans?

How do I clean the dirt from my Macbook Pro's fans?
I've had my laptop for about 2 years now and I try and clean it on a regular basis, and it never really had any fan or overheating problems, but the past few months the notebook gets really hot and the fan sounds like it's going nuts whenever I try to stream or view videos.
I've reset the PRAM already so it isn't that, I was thinking that the fans might be dusty, as someone I know had a similar problem with their HP laptop and they cleaned out a 3/8" piece of dust/dirt from the fans and now it runs smooth.

Reset the SMC, a PRAM reset doesn't do anything for the fans. The correct process is:
_SMC RESET_
• Shut down the computer.
• Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
• On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
• Release all the keys and the power button at the same time.
• Press the power button to turn on the computer.  
If that still doesn't work then remove the back cover of the computer and use a vacuum to remove dust from the fan area. This is easily done if you have a unibody MBP.

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