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Starting with 400-600 is really aggressive. My wife's car had bad yellowing haze and I started with 1000 then 1500 and finally 3000. Then polished it with Meguiars lens cleaning polish bot from Pep Boys. They sparkle. Word of caution , go light pressure with the sanding action. It is only plastic and scratches pretty easily. Too much and you will scar the lens. Also Griot's Garage.com has a really nice 3 inch oribital polisher for about a hundred bucks with the pads. Great for doing this kind of work.
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