You have omitted the Key Data Point: What brand/type of laptop?
Because I have a Dell Latitude E6400, and even though it looks like a sealed hunk of plastic too, it's stupid-simple to remove the keyboard (which I found out when I spilled half a cup of tea into it, but anyway), and that gives you pressuruzed-air-can access to the fan and most of the motherboard. I found the "how-to" videos online. Try Googling for your make/model; it might be easier than you think.
no subject
Because I have a Dell Latitude E6400, and even though it looks like a sealed hunk of plastic too, it's stupid-simple to remove the keyboard (which I found out when I spilled half a cup of tea into it, but anyway), and that gives you pressuruzed-air-can access to the fan and most of the motherboard. I found the "how-to" videos online. Try Googling for your make/model; it might be easier than you think.