True to some extent. You can always take off some of the screws to take off the plastic bottom cover and do a fuller cleaning. Doing burst blasts on the CPU, at least, will unclog that dust that raises the temp on the CPU, which degrades not only your windows experience, but the life of the cpu.
Thanks, Gipper.
I wondered if I could take a vacuum hose and place it above the vent which I thought would pull all the dust out?