Yeah Ryuk is totally right, I guess I forgot to add to my reply, "It's at your own risk".
Cookiezzzz solution is a great choice I saw this video on youtube of a guy cleaning the dust of his laptop with a vacuum, but I couldn't find it today so I can't link you to it. But anyway I will try to describe it.
He used a piece of paper to cover a third maybe a half part of the vacuum hose and just began vacuuming the fan through the air intake of the laptop.
Maybe that could do the trick without you having to open your laptop.