I paid £15 for a proper screen cleaning kit but it just turned out to be sachets containing cut-down windscreen cleaning "wet wipes." You may as well go to your local Halfords and buy a pack of "Screenies" costing under a fiver because I can assure you that they are made of identical material and the solvent in both is isopropyl alcohol. You will end up with a much larger pack too!
Tip: Brush off all the dust with one of those wonderful Flash dusters first. LCD screens are very soft and easily scratched by dust particles.