With a laptop, dust and hair are serious culprits. I try to vacuum the keyboard surface and the table I usually have it on at least once a week. You will want to run the vac over the various laptop vents (with a crevasse tool for more suction) to get as much hair and dust out as possible. There should be a couple of vents on the bottom, one each for the CPU and GPU intakes, make sure those are clear.