For everyday maintenance simply blast the monitor with compressed air to remove dust and environmental debris. From time to time, however, you’ll want to do a more thorough cleaning and for that dampen a clean microfiber cloth with distilled water. Wring it out to the point that no more water can be extracted from it that way. Fluff it up a bit after wringing then wipe the game screen using broad strokes either top to bottom or side to side. Avoid circular motions and don’t spend too much time on a single spot. It doesn’t take much to leave a permanent scratch or scrape on the monitor surface, so be careful how much pressure you’re applying as well.