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The best I have used on yellowed lenses has been toothpaste to clean to like new and then use a product called Plexus. It comes in a blue aerosal can and is the product used by the military to clean the windows on the B-1 and such. It is really great and lasts as long as a wax job. Be careful on the "glass" lenses since they are not really glass and can scratch very easily.
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