I agree with foxrun - it is on the outside. The product that does the cleaning is actually an extremely mild abrasive that is applied and polished. You need to use the product from the automotive store, anything else is too harsh.
It may look foggy on the inside but I think it is on the outside. 3M Co. mades a product sold in automotive stores that will clean the outside of the lens. A little time consuming so check out what has to be done and the price of the product. Or you could check out salvage yards to see if they have the lens for your car that would be in good shape.
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