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In case VVPete doesn't get back to you. - It sure sounded like he meant to clean the inside, but since the yellowing is caused by either ultraviolet light or exposure to harsh oxidizing chemicals, if there is any yellowing on the inside surface, the plastic must be yellow all the way through.
For my part, if I go to the trouble to remove the headlight housings and pry off the lenses, I'm not going to fool with 15-20 year-old lenses. New aftermarket plastic lenses are not that expensive, and they let a lot more light out.
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