Lenses aren't available separately, and even if they were it's a bit labor intensive to split & re-seal one.
Polishing the lenses works extremely well, but you need to apply a protective finish to keep UV light off. The UV exposure is what fogs the plastic in the first place, and polishing the lens removes the remnants of the factory coating. Without a fresh coat they'll re-fog very quickly.
I used a big-brand rattlecan with a clearcoat paint that included some kind of UV protection.So did you apply a protective coating after you polished them as others have been suggesting? I don't think just polishing is a long term solution - you need to protect the work you did by polishing.
This kit includes a protectant: https://www.amazon.com/Sylvania-HRK-BX-SYLVANIA-Headlight-Restoration/dp/B00429NKWK/ref=sr_1_2?ie=UTF8&qid=1508256524&sr=8-2&keywords=sylvania+headlight+restoration+kit
I tend to agree - I've seen lights start to fog over on cars that are garaged all the time.I may be wrong but I don't think this is sun damage. I have never had this happen to any of my cars. I traded 2 cars (12 and 13 years old) for my '15 and both sets of headlights were perfect (less a gravel nick here and there). Maybe it's because I only use an auto car wash once or twice a year. Even though garaged at night, both were out in the sun all day. Never clouded like this. Reminds me of old convertible plastic windows. I was told never to use anything like Windex on them. Always just used plain water and never clouded. Maybe it's ammonia.
Not sure. The cars I traded, one with 211K miles and the other with 160K were showroom fresh. 60 mile commutes, 30 on expressway.I tend to agree - I've seen lights start to fog over on cars that are garaged all the time.
I'm thinking it has more to with miles and slowly getting sand-blasted by the road funk - I'm thinking my 2012 with 121K miles will need new headlights soon and my roomate's 2003 Mazda with 130K miles we replaced her headlight housings last year. She had tried some of the "restore" things but they didn't seem to do much. A couple hours of taking stuff apart the bumper and putting it together looked like a brand new car and was over-all less work we think.