HOW DO I CLEAN THE INSIDE OF MY MAC?  (1.5)
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       I don't advise taking a Mac apart just to clean it; but if 
  you've already dismantled it as part of another upgrade or repair, 
  blowing accumulated dust away with a can of compressed air won't 
  hurt.  You can also use a specially designed computer vacuum 
  cleaner, but don't use a normal hand vac like a Dustbuster as 
  there's a small chance of damage to your Mac from the static 
  electricity it builds up.

       On the other hand if during one of those late night football 
  games through the halls of your office someone drop-kicked a 
  half-full can of Mountain Dew straight through the uprights of your 
  cubicle onto your Mac (or if you've spilled a soda or some other 
  messy substance into the Mac in some less creative fashion), you 
  will need to clean it out.  Unplug the Mac and let it sit for at 
  least an hour.  It is essential to give all the parts of your Mac 
  time to discharge since you'll be cleaning it with water.  Take the 
  Mac apart as described in the next section.  Then clean it with 
  lukewarm tap water.  Use a soft toothbrush to clean anything that 
  doesn't come off with water alone.  Let the disassembled Mac air dry 
  for a couple of days, (Don't even think about using a hair dryer.) 
  and then put it back together.