The owner's manual says not to put anything abraisive on the lens. When I bought my car a month ago, the lenses were horribly cloudy. I've used Meguires lens cleaner on them about 5 times and they are better. I want them to be crystal clear. I this an unrealistic expectation? I figure these lenses have been under the sun for 10 years without any treatment. Is there anything else I can do?