questionsdoes this stuff work? is there any home grown…

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I will say yes - conditionally.
I would trust the lens restorers from Meguiars or Mothers or 3M.

I am not saying that the Fast Brite stuff is no good, just that the others might be better. Unless you're tackling a fleet of cars, you won't need more than one or two applications every 4-5 years.

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Basically, all the headlamp restore kits work the same.
1. Using a light-weight gritty polishing compound, polish the etched and oxidized surface away.
2. Protect the newly polished surface with a hard wax compound (carnuba wax, etc).
3. Enjoy clear headlamps.

Presumably you can polish the lens until the polycarbonate lens is too thin and brittle to continue. The lens is probably 3-5mm thick (1/8"-3/16").
You would polish away around a few microns of plastic each time you polish the lens, so you can polish the lens many thousands of times before the lens is degraded.

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You can probably accomplish the same thing with tartar-control toothpaste (or a lapping compound), carnuba wax, a pair of buffing pads, and a drill.

I would not recommend the above process. I'd just bite the bullet and pay $20 for a proven kit.

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Evidently the 3M method includes sandpaper to prepare the surface for polishing. I'd say this one is the one to try if the lenses are almost junk and you're trying to avoid spending $360+/ea for a new headlamp cluster.

$360 is about how much they are for my Focus. So there.

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Not sure about this item....I think @lumpthar has shed a lot of light on it (pun intended).

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@jsimsace: I was just wanting to provide a complete answer. :-P

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@lumpthar: Thanks, and no worries about the answers, I have answered the same way before. It was what I was looking for.

Thanks to all the responded.