Foggy Headlight Restoration Paste
A mild abrasive paste that removes oxidation and yellowing from plastic headlight lenses
30 min intermediate Yields Enough for 2 headlights
Ingredients
- 3 tbsp Baking soda
- 1 tbsp White vinegar
- 1/2 tsp Liquid castile soap
- 1 tbsp Water (add more if paste is too thick)
- 1 tsp Coconut oil (provides a temporary UV-protective coating)
- small amount Automotive paste wax (for the final sealant step)
Steps
- Clean the headlight lens with soap and water. Dry completely.
- Apply painter’s tape around each headlight to protect surrounding paint.
- Mix baking soda with vinegar and water to form a thick paste. Add castile soap and stir smooth.
- Apply the paste with a damp microfiber cloth using firm circular motions, 2 to 3 minutes per headlight.
- For heavily yellowed lenses, reapply fresh paste and scrub another 2 minutes.
- Rinse with clean water and dry with a microfiber towel.
- Apply a thin layer of coconut oil with a soft cloth, buffing in circular motions.
- For longer-lasting results, apply automotive paste wax over the headlight and buff after 5 minutes.
Why It Works
Baking soda (Mohs hardness 2.5) is soft enough to avoid scratching polycarbonate (Mohs 3.5) but abrasive enough to remove the oxidized yellow layer. Vinegar acts as a mild chemical stripper for oxidized material. Coconut oil fills micro-scratches left by polishing, making the lens look dramatically clearer. Wax creates a sacrificial UV barrier that mimics the factory clear coat.
Tips
- Lasts 2 to 4 months without wax, 6 to 12 months with it. Reapply seasonally.
- For the most durable results, apply a spray-on UV clear coat instead of wax.
- Work in the shade. Sun heats the plastic and dries the paste too fast.
- Do not use on glass headlight lenses found on some vintage vehicles.
- If yellowing is on the inside of the lens, no external treatment will help.