How to Clean Your Car Headlight

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It doesn’t matter how fast your car is, you can only drive as fast as you can see down the road ahead of you. When the plastic lenses on your headlights get hazy and oxidized, they disperse the light and reduce your visibility. Here’s how to clean them.

How to Clean Your Car Headlights

(Debbie Williams/Demand Media)

Things You’ll Need

  • Dish detergent
  • Car wash cloth
  • Several microfiber detail rags
  • Painter’s tape
  • Rubber spatula
  • Razor
  • Foam sanding block or large, thick household sponge
  • Approximately five 8-inch strips of 500-grit “dry” sandpaper – or two full-size sheets
  • Approximately five 8-inch strips each of 1000- and 2000-grit “wet” sandpaper –or two sheets each
  • Gallon pitcher
  • Spray bottle
  • Headlight lens or plastic polish
  • Rubbing alcohol
  • Headlight lens sealer
Step 1:Do one headlight at a time. Start by washing the lens and surrounding area completely using dish detergent. Normally you’d avoid harsh detergent because it strips your car’s wax and dries out the paint, but that’s what you need in this case. Rinse and allow to dry completely.

Debbie Williams/Demand Media

Step 2:Apply painter’s tape to the car’s body around the headlight, making sure to cover the rubber seal around the headlight (if there is one). Apply more tape for a wider margin of safety. Use a rubber spatula to press the tape down and work it into the crevices around the light. Use a razor to trim away excess tape where the rubber seal meets the lens.

Debbie Williams/Demand Media

Step 3:Wrap a strip of 500-grit sandpaper around a foam sanding block or large sponge. The foam helps distribute pressure on the sandpaper so you don’t leave deep gouges in the lens.

Debbie Williams/Demand Media

Step 4:Press the sandpaper-wrapped block to the headlight lens, and start sanding the lens in a back-and-forth motion. Every 10 seconds or so, switch the direction of sanding. This straight-line, alternating-stroke method avoids putting circular swirls in the plastic, which will show in the finished product.

Debbie Williams/Demand Media

Step 5:Keep sanding until the surface is uniformly frosty and completely opaque. Keep sanding until it feels as silky smooth as sanded pinewood.

Debbie Williams/Demand Media

Step 6:Wipe the headlight down with a microfiber cloth to check your work. Be sure you adequately sanded edges and corners. When you’re satisfied, rinse the headlight with clean water.

Debbie Williams/Demand Media

Step 7:Fill a gallon pitcher with water. Add dish detergent and drop in a few pieces of 1000- and 2000-grit sandpaper to soak.

Debbie Williams/Demand Media

Step 8:Fill a spray bottle with soapy water from the pitcher and heavily mist your headlight. Wrap the foam block 1000-grit sandpaper and sand the headlight just as you did with the 500-grit. Keeping the spray bottle in your other hand, give the lens a fresh spray every time you change sanding directions. Keep it wet and slippery.

Debbie Williams/Demand Media

Step 9:Sand until the paper slides smoothly over the headlight lens and you can’t feel any rough spots. Rinse and dry the lens, preferably with compressed air. Look at the lens from an angle. If you see irregularities, re-wet the lens and keep sanding with a fresh piece of wet sandpaper.

Debbie Williams/Demand Media

Step 10:Wash, rinse, and repeat with 2000-grit paper. Rinse and dry the lens completely when you’re finished. The lens should be almost uniformly clear (with some slight hazing).

Debbie Williams/Demand Media

Step 11:Fold a microfiber polishing rag into quarters. If you’re using liquid headlight polish, run a thick line of polish along the top of the headlight. If you’re using a paste-type plastic polish, load your rag up with about an ounce and smear it all over the lens.

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