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As a warning, not all window cleaners have the same chemical makeups, and some of these chemicals might eventually cause fogging of the LCD plastic. Not a problem if your brief is to keep some machines looking good for a period of *months*, but a possible consideration for years. I find that a quality microfiber cleaning cloth - the most expensive kind that good photo stores sell - will do a good job all by itself (no cleanser or water), even on my son's greasy fingerprints. Every 2 months or so I will also clean the screen with one of those ridiculously expnsive LCD screen cleaning wipes. - David >said that he worked for IBM. I then asked him how he kept the screens >all looking so nice, with no major greasy smudges. > >To my complete amazement, he said that he turns off the units and then >uses Windex and paper towels. He pointed one out that he said had been >in service there for a few months, and had had this screen cleaning >treatment several times a day. I could see nothing wrong with the >screen at all, not even a scratch.