Have you tried looking for your notebook's service manual on the 'Net? Seems there are several sites that you can download (or purchase for a small fee). That would tell you how to correctly remove the keyboard.
However, you can get a can of compressed air and blow out the fans by inserting the can extension (usually a little red plastic pipe tip) into the fan intake and press the trigger. Short controlled bursts. You will see crud come out of the exhaust side of the fan.
Just go easy, with the system powered down and you'll be okay. Good luck!