My 04 SVT has a set of Mach Audio HID's that were originally on my old ZX-3, and they have gotten rather nasty looking so I have decided to restore them, and here is how I did it.
Here is the passenger side, you can see they are rather dull and nasty looking,
So I got some 1000 grit sand wet/dry sand paper to get out everything but the deep nicks, wiping down the plastic every couple of minutes and keeping the sand paper pretty wet.
Next I removed the 1000 grit marks with some 1500 grit paper, using lots of water and wiping as I went.
Then I went to 2000 grit, by then the light looked pretty foggy but was very smooth, and to be honest looked better foggy than it did before I started.
To get out the 2000 grit marks I went up to Wal-Mart and picked up some of this stuff...
I found out you need to go SLOW with back and forth motions, if you go too fast or use too much power on your drill you will make some burr marks on the plastic and then you will have to resand that section with a bit of 2000 grit and go over it again with the polish pad. This stuff is basically an attachment to an electric drill and some stick on polish pads and you will use 2 or 3 per light.
I will say again during the entire process go SLOW, it took me an hour and a half to get my drivers light looking like this...
I just got done with the drivers light and I was so impressed I figured I'd post this before I started on the passanger light.
I have some Lamin-X on the way and when it gets here I will probably go over the lights again real quick with the polish pad again.