I got some foam in a can stuff that works an absolute treat - Computer Care - Scree Cleaner - cost me about a tennar from a well known computer shop! +44
my laptop has smudges on it from where i've licked my finger to wipe things off it. turns out i shouldn't have done that
I damp the corner very soft towel, wipe the figure prints off then buff the area with the dry side. Works amazingly well.
i picked up som ixos anti static screen cleaning gel spray and anti static wipes for under a fiver at a well known computer shop!
Boots glasses cleaning cloth, lint free & very soft with a few drops of water to make it damp. no chemicals here and works a treat @ £1.50