This method works best!
Headlight Restoration Method
In this process you are going to sand your headlight lenses with two or three grades of fine sand paper, then re-glaze the plastic with polish to restore a clear finish.
Clean the headlight lenses. A bucket of soapy water works best. Clean the surrounding area, too. Dry thoroughly.
Use painter’s masking tape to mask around the headlight. This will help protect your car's paint finish. This only takes a couple minutes, so don’t skip this important step.
Wet sand each headlight. First determine the amount of damage to each lens. If your headlight lenses are scratched or if they are completely opaque, you will need to start with 600 grit sandpaper. Sand thoroughly, and then progress to 1200, then 2000 grit.
If your lenses have no scratches and are only slightly opaque, you can probably get away with using 2000 grit paper only. The first sanding step is where you will actually remove the scratched and cloudy layer of plastic. The finer grades of sandpaper are to remove the scratches left from the previous grit sandpaper.
As you sand, your sanding water will turn milky. This is the damaged layer being removed. Use plenty of water for lubrication and to keep the sandpaper clean. Keep sanding until the surface feels perfectly smooth. The drippings will become clearer as the damage is taken away. Dry thoroughly between sanding steps to check progress.
Soak your wet/dry sandpaper is water for 15-20 minutes before use. This softens the paper, making it easier to use.
Never sand with your bare hand. For best results, use a sanding block or pad to keep the paper flat. A 1” by 2” school erasure is the perfect size for headlights and spot repairs.
Sand in straight lines, never in circles, and your final buff out will be much easier.
Be sure to keep the surface wet as you sand. Soapy water works best.
Re-glaze headlight lenses using plastic polish on a 3” polishing pad (foam or wool). First connect the Velcro backing plate adapter to your drill.
If you’re using a wool pad, it should not be used at high speed. Wool pads generate a lot of heat, so use a cordless drill or the slow speed on your electric drill.
Apply several dabs of polish to the pad and begin polishing the lens. As the polish begins to dissipate, add a little more and continue polishing. Stop polishing once the lens is completely clear again. Finish with a final hand polish using a small amount of polish on a microfiber towel or applicator.
Wax or seal to protect. Use a good auto wax to reseal the lenses and protect from the elements.
Maintain monthly with a quality plastic cleaner/polish. The product I recommend most is Plexus. Use it regularly, just like a glass cleaner, and your car’s clear plastic lenses will never need restoring again!