I use a lint free duster and some auto glym instant show shine polish that i generally use on my bike. ( I am such a sad git ) then the missus comes along and hoovers it with the soft brush attachment ! ( she is even sadder ! )
Its got spag bol and the results of various sneezes on it!! If i use a damp cloth or amyhting i get a huge mark which doesnt hurt the screen but if the light is in a certain direction then it looks horrid!!