With the laptops ive worked on, the keyboard comes off in 1 of 2 ways..
1:Plastic piece stretching the length of the keyboard right above it usually where lights are will pops off easily with small flat-head screwdriver
2: at very top of keyboard there will be some small clips that just need to be pushed up with a small flat-head screwdriver.. they keyboard should pop up after this
I used canned air, a toothpick, and many many q-tips to clean my keyboards.. if the keyboard is REALLY bad, might as well buy a new one.. about 20-50$ depending where u buy it..
-Evil Juggalo