My wife is an Optician and she brings me all of these little lint free cloth things for cleaning glasses. Those work great and I feel confident that this will not scratch or dull the lens in any way. I have never used any type of liquid solution or cleaner on the lens. A simple wipe with the cloth does the trick for my projector. You may have heard of Crizal lenses for eyeglasses. They sample out a nice little cloth and that is what I use.
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