As Rayuk, I do the same using filtered water to damp the cloth and then buff with a soft clean cloth. I've needed to do this umpteen times with my son's laptop [Occasionally with a little mild soap added to the water for stubborn spots] and not a mark on the screen yet.
Had my own TFT for 8 months now and just flick a feather duster over it each day, never needed to use anything else yet.
i use tft wipes from pc world or a bottle of stuff i got from a pc fair which is better than the wipes , couldnt tell you what its called cos its not labelled , i was dubious too at the time but i picked a random bottle from the table they were on and made the guy test it on one of his tft screens (one i chose) and thats the bottle i bought.
ViewSonic say they will not be liable for damage resulting from the use of alcohol or ammonia-based cleaners. Their advice is to try a soft, dry cloth: for stubborn marks use a mild non-abrasive detergent on a clean, soft, lint-free cloth
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