I recommend straight rubbing alcohol. It is already diluted. More wate is not good as previously suggested. Pure alcohol is best but only available as an industrial product. Diluted alcohol leaves a residue film behind. Make sure you use a non-shedding very soft clothe or camera grade lens tissue. Dust behind the screen should be blown out with camera grade canned air (available at any photo store and many computer stores, websites etc. 73
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