If you are in the Uk you can buy special wipes to clean laptop, pc and tv screens with. I bought mine in currys. Think they were about £6 for 200 wipes
i would use the keyboard cleaner that is just special compressed air that will blow off most dust and grit from every day use, but if your a minor you may have trouble when you try to get it.
Spray some Windex on a soft cloth and wipe the screen with it. DO NOT use something like Fantastic because it has an oil in it and that will leave a film on the screen.