The I.T manager at work uses normal Windowlene for cleaning the TFT screens on the laptops.
However, if you are worried about damage, there are plenty of products out there designed specially for cleaning computer screens.
There was an article in another computer mag (sorry FE!) about cleaning your computer:-
"Most modern monitors have a special coating on the screen to limit reflections, and this can be damaged easily if cleaned incorrectly. The best way to clean screens is to use special cleaning wipes. Use them according to the instructions; use the first wipe to clean the screen and the second to dry and polish it.
If your monitor is knocking on a bit, or you don't want to buy special wipes, a careful application of a water and vinegar-based window cleaning solution will clean both TFT and CRT screens but extreme care should be taken to ensure that the screen is cleaned but not moistened as the water may run down the screen and into the internals."
As for the screen wipes:-
do a range. Have a look under:-
Technology & Machines\Computer Peripherals & Accessories\Accessories\Cleaning