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You are right not to use window cleaner. In fact stay away from pretty much all household cleaners. The LCD screen cleaners vary greatly in their effectiveness - I’ve tried one that streaks so bad that the screen was much worse AFTER I cleaned it than before. Now I “roll my own” for both home and office use. Just get a squirt bottle and a 50/50 mix distilled vinegar and distilled water. Cheap, effective, and you can easily make more as needed.