Hi Peoples,I just bought myself a 1998 Infiniti I30 and I love it. This weekend, I decided to clean up my cloudy headlights. I thought I'd share the how to's with yall. I learned this from a Lincoln forum.
What you will need:
1000 grit sand paper, 1200 grit sand paper, 1500 grit sand paper, and 2000 grit paper
car polish
soft cloth or those blue autozone paper towels
spary bottle
elbow grease
Start with the 1000 grit paper and spray water all over the headlight assy' and the sand paper. Its best if you leave the hood open so you don't accidentally scratch up the hood. Start sanding left to right for about a minute, making sure the surface is always really wet. Then go up and down for another minute or two.
Then go up to the next grade of sand paper and repeat the above steps til you go all the way through with the 2000 grit.
Then repeat the whole process, but the second time, do it a little longer with less pressure. After all the wet sanding, the headlight is gonna look clear, but cloudy. Dry off the headlight assy', thoroughly and put a dime size dollop of the car polish into the soft cloth. Then wax on and wax off in circles. The more you polish with the car polish, the better and clearer the headlamp looks. Enjoy your brand new headlamps!

This is the before headlight assy'.

After the wet sanding, notice the cloudiness.

Polished with the Turtle Wax car polish

Finished headlight assy.