To restore cloudy headlights, tape off the paint, wet-sand the lenses with finer and finer sandpaper, polish them clear, clean them, and finish with a UV-blocking clear coat made for headlights. Arizona's strong sun breaks down the clear coating that protects plastic headlight lenses, which is why they turn yellow and hazy. The sealing step matters most, because without it the haze can come back quickly.
Time: about 1 to 2 hours. Skill: moderate.
Why do headlights turn cloudy?
Most modern headlight lenses are plastic with a factory UV coating. Years of sun wear that coating away, and the plastic below oxidizes. Dim lenses cut how far you can see at night, so this is a safety fix, not just looks.
What do you need?
- Painter's tape
- Waterproof sandpaper in several grits, such as 800, 1000, 1500 and 2000 to 3000. Many kits include them
- A spray bottle of water
- Plastic polishing compound and clean microfiber cloths
- Rubbing alcohol
- UV-blocking clear coat or sealant made for headlights
- Gloves, eye protection and good ventilation
How do you restore cloudy headlights?
- Work in the shade, and in the morning if you can. A hot lens dries your products too fast. Avoid windy, dusty conditions, because dust sticks to the wet sealant.
- Wash the lenses with soap and water and dry them.
- Tape around each headlight with painter's tape, two layers if you can, so the sandpaper cannot touch the paint.
- Wet-sand with the coarsest grit first. Spray the lens and sand in straight, even lines, left to right, with light pressure. Keep it wet. The lens will turn evenly frosted and milky, and the yellow should come off. That is normal.
- Move to the next finer grit. Sand in lines the other way (up and down), still wet. Repeat for each grit, ending with the finest.
- Wipe the lens clean. It should look uniformly dull, with no deep scratches.
- Polish with the compound and a clean cloth, using firm circles, until the lens turns clear.
- Wipe with rubbing alcohol to remove oils and polish residue.
- Apply the UV clear coat exactly as the product directs. Apply a thin, even coat. Keep the lens out of sun, dust and water for the time stated on the package.
How long does it last?
It depends on the product and how much sun the car gets, but Arizona is hard on lenses. Parking in shade or a garage helps. Avoid harsh cleaners. Some people use toothpaste or quick-fix wipes, but those fixes do not protect the lens and tend to wear off soon.
When should you replace the headlight instead?
- Moisture or fog inside the lens
- Cracks or chips in the lens
- Deep yellowing or pitting that does not clear after sanding
- The light is still dim after you restore it, which may be the bulb or the wiring
When to call a pro
Call a pro if the lens is cracked, wet inside, or still dim after restoration. A shop can check the bulbs, wiring and aim. If you have had a collision, headlights are often part of the repair. Here are local auto body shops in the directory, with phone numbers:
Ask any shop what they do for headlights before you visit. You can also ask the helper or browse Phoenix businesses.
Questions people ask
Why are my headlights yellow and cloudy?
Sun and heat wear off the protective coating and the plastic oxidizes. It is very common on older cars in Arizona.
Does toothpaste really fix cloudy headlights?
It can brighten them for a short time, because it is a mild abrasive. It does not seal the lens, so the haze usually returns.
Do I have to use a UV clear coat?
Yes, for a lasting result. Sanding removes the old coating, so without a new UV layer the lens will yellow again quickly.
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