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Buy a few of these. They are cheap. Soak one in water and then twist it hard until no water drops from it, so it's nice and damp. Then use it to wipe the screen softly until you remove any dust. Turn it on the other side and wipe a bit harder on spots that have more resistant fingerprints or whatever. Then use one of the dry fibre cloths and wipe softly to dry the screen. It should be like new.
For the chasis, turn the damp cloth on a new side and wipe gently across the body and keyboard. Don't do this with dirty clothes cause it will drop dust under the keys.
I do this daily, or between a few days and keep my mac pristine. I despise fingerprints on the screen and think people who keep their glossy screens full of them are messed up in the head somehow... It's gross.