ok, i know this sounds harsh, but if you don't wanna spend the money just use windex and a tissue. I have an ibook and have used windex or simular with a normal tissue many many times and have had NO issues what so ever. Just spritz on the tissue and wipe and maybe a separate tissue for drying. If you are really concerned just get eyeglass or lense cleaner kit for a camera and use that. 😀