On each reboot do you hear the boot chime? If so maybe you can "sneak in there" by pressing the shift key to attempt to boot in safe mode. See if that breaks the cycle.
Alternatively if you can slip in your installer dvd and press the C key after the boot chime then perhaps it will boot from the dvd which would give you a chance to run Disk Utility to attempt to repair/verify your boot drive.
Apple doesn't post any recommendations about cleaning the inside of a macbook pro. But apparently that hasn't stopped folks from doing it so here's two suggestions.
2. OWC has plenty of instructional videos on things like adding hard drives to macbook pro's. So those videos obviously show how to open the machine to get inside which is all you care about to get at the dirt.