Re: Potential damage to laptop
Well, all the dust overtime creates a thin thermal layer that can trap heat which may result in hardware failure overtime--but that's worse case scenario. It's good to have it dusted out at least once a year. I'm using a laptop too and all I do is spray the exhaust area and whatever crevices I find. I don't open it up though. To major. Sooner or later, we'll all be buying new laptops soon.
Opening the case uses simple screws and screwdriver. Just be careful you can put it back together.
*Fact: Microsoft Window's Blue Screen of Death vs Computerforums.org's White Screen of Death. Which is worse?