When I had my camaro, I polished them out. But then you have to do it every 6 months or so. First I took scotch bright to remove all the built up yellowing. That of course scratches the lenses. Then I got a plastic polish and used a polishing wheel on my drill and had at them. After about an hour or so you should have one that is pretty damn clean, and then you do the other. Key is the polishing wheel and your drill.. There ain't no f'in way they are getting clean by manual labor alone.