The best way to get the longest life and the most use out of your projector screen is to clean it regularly. However, many people actually end up damaging their screens by following this very rule because they do not realize how important it is to clean a projector screen with the proper materials. Cleaning your projector screen regularly will prevent dust and dirt buildup that will interfere with picture quality and require harsher cleaning efforts. Just make sure you are using the right materials and your projector screen could actually last a lifetime.
Dust off the screen with a dry rag. If you clean your screen regularly, this will nearly always be sufficient. Be gentle and run the rag over the entire screen. If there are portions that have built-up dust on them, increase the pressure slightly, but do not scrub with the rag.
Fill the spray bottle with warm water. Do not add any detergents or cleansers; these will fade your screen. Simply fill up the spray bottle with hot or warm water and then get right back to cleaning before the water cools.
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Spray a clean rag with the warm water. Run the rag gently over the entire screen. Once you have started cleaning with a moist rag, you need to clean the whole screen with it. Cleaning different parts using different methods can affect picture quality over time. Use gentle pressure on the spots of built-up dirt and the moisture should lift the dirt right off. If your rag becomes too dirty, switch to a new one so that you are not just smearing dirt around on the screen.
Dry the screen with a clean rag. Do not let the moisture air-dry or you may end up with a ripple effect and water damage to your screen. Wipe it down immediately using a soft, clean rag. Now your screen should be as good as new and ready for the next big show.