Use furniture polish like Pledge in a spray can.Spay it on the plexiglass surface and use a soft cloth to polish the surface. I work for the fire dept I discovered this when I was looking for a way to clean the plastic lenses on the emergency lights. Works very well and will removes minor scratches & blemishes with a little "elbow grease"!! I use it on my windshields everytime I wash the boat. Bugs and the like come right off!!
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