I can’t point out enough how often people bring me their laptops and tell me its broken when the only problme is dust.  You should dust out your laptop at least once a year, ideally more, otherwise your laptop can easily overheat.

Get the Dust out:

Dust and hair(pets) can fill your laptop’s vents, causing the machine to overheat.  Pick your notebook up and check the vents to see if dust bunnies are covering the vents. Brush or blow it out with compressed air.  More adventurous types can unscrew the bottom of their notebook and give it a more thorough cleaning. Also if you remove the keyboard in most models you can easily clean the fan and heat sink as well.  Just be careful, power off your laptop and remove the battery before you do all this. 

Clean the screen:

Don’t use anything with alcohol, ammonia or solvents.  You can use distilled water and a clean cloth to clean it.  If your machine is really dirty, try a mixture of 50 percent distilled water and 50 percent white vinegar.  Start by turning your notebook off and remove the battery.  Then moisten a clean cloth and wipe it gently across the screen.  Do not spay liquid directly onto the screen. Do not put too much pressure or you might crack the screen.

Tidy the keyboard and touchpad:

Hold the laptop upside down and give it a gentle shake to help dislodge any gunk.  You’ll need a can of compressed air to blow out dust and crud that has built up over the year.  Next, get some cotton swabs, dip them in same cleaning solution used for the screen and wipe the side of the keys. Make sure it’s not too wet cause you don’t want liquid to drip  on the keyboard.