Compressed air for cleaning out your machine. Well, I just tried mine on my keyboard first time ever and four years of snack sinning reappeared from behind and under all the keys. It took four tries, but looks like a new and dust-free computer now. Give it a try!
Good for you, I don't think I would be game to use canned air on my machines or computer I have seen it blow dirt where you can't see where it has gone.