Amazon has the Turtle Wax T-240KT Headlight Lens Restorer Kit for $8 with free shipping on $25+. Restores dull, yellowed headlights to like new condition in less than 5 minutes per lens.
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Whether this stuff works or not depends on the condition of your lenses. I watched a guy work on my wife's Audi for almost an hour with a buffing machine and he turned them from yellow to cloudy.
This does work - but don't expect crystal clear lens
#1, he didn't know what he was doing. If using a power buffer you have to use only light pressure and move it around constantly or it overheats the surface of the plastic and turns it cloudy, even embedding the abrasive into the plastic so it's as much if not more work than it was before he started.
It's best to do the restoration when it's cold out so the plastic is at its hardest, to move around a lot and switch headlights, back and forth doing so. Otherwise, the more laborious but safer way is to do it by hand, starting out with wet/dry sandpaper then moving to abrasive polishes.
Their claim of less than 5 minutes per lens is overly optimistic, that would tend to be how long it took to touch them up if you had restored them within the last 3 years or less if the vehicle is outside all day, most days, not the first time you restore them on an aged and yellowed lens.
I thought the yellowing/clouding was due to the entire plastic assembly turning that way due to weather/ultraviolet exposure, in which no amount of buffing is going to clear?
Yes initially UV exposure turns the polycarbonate yellow and hazy on the surface, but excessive heat also turns it cloudy so you have to keep it cool enough by not letting the buffer sit in one place too long or with too much pressure. With just about any abrasives, even something too fine to be ideal, it shouldn't have taken an hour with a buffer.
or you can just buy new lenses.
Consider the 3M kit, it does use a drill. Doing this sh!t by hand is a lost cause. Also point a fan at the lens, this will help to blow away the plastic dust (a Vornado works best) and will help to keep the lenses cool. Also look to see what new lenses cost, they don't have to be OEM, 3rd party is fine for an older vehicle. Be sure to use a sealer every 6 months. Check out head lights depot .com
or you can use autosol. don't follow the video direction. just use a latex glove and squeeze out 3 pea-size and spread it on a lens and wipe it off with an old t-shirt. it takes about 3 minutes. it's not permanent so you need to repeat it every few months.
This stuff does work as I have used it. Did it to an old dodge ram's headlights that were very cloudy and this cleared them right up