The Yellowing Enigma: Why Headlights Lose Their Shine and How to Restore Them
Introduction
Have you ever noticed that over time, your car’s once-clear headlights can start to appear yellowish or foggy? This common issue isn’t just an aesthetic concern – it can also affect your safety on the road. In this article, we’ll delve into the reasons behind this phenomenon and explore effective methods to restore your headlights to their former glory.
Why Do Headlights Turn Yellow or Foggy?
Headlights are typically made from polycarbonate plastic, which is durable and lightweight. However, this material is susceptible to UV radiation, environmental pollutants, and general wear and tear. When exposed to these elements, the outer layer of the plastic can become oxidized and damaged, leading to the yellowing or fogging of headlights.
UV Radiation: The sun’s ultraviolet (UV) rays can break down the molecular structure of the polycarbonate plastic over time. This degradation not only affects the appearance of your headlights but also reduces their effectiveness in illuminating the road at night.
Environmental Pollutants: Airborne pollutants, such as dirt, dust, and chemicals, can accumulate on the surface of headlights. These particles can chemically react with the plastic, causing it to become discolored and hazy.
Moisture and Condensation: Moisture can seep into small cracks and crevices on the headlight surface. When this moisture evaporates, it can leave behind mineral deposits and create a foggy appearance.
How to Restore Yellowed or Foggy Headlights
Cleaning: Before considering any restoration methods, start by giving your headlights a thorough cleaning. Use a mild soap or plastic-safe cleaner, along with a soft microfiber cloth, to gently scrub away dirt and grime. This step might significantly improve the clarity of your headlights.
DIY Headlight Restoration Kits: There are various headlight restoration kits available on the market. These kits typically include sandpaper or abrasive pads, a polishing compound, and maybe a clear coating. The process involves sanding away the oxidized layer, polishing the plastic, and applying a coating to try and protect the headlights from future damage. This tends to last anywhere from a few weeks to a few months depending on a number of factors.
Toothpaste or Baking Soda: Yes, everyday household items like toothpaste or baking soda can be used to restore headlights. Apply a small amount of toothpaste or a baking soda-water paste to the headlight surface, then gently rub in a circular motion with a soft cloth. Rinse and repeat until the desired clarity is achieved. In our experience this is a short term result at best as the exposed plastic quickly oxidises again.
Professional Restoration: If you’re not confident in your DIY skills or if the headlights are severely discoloured, seeking professional help is the best option. Final Touch offers headlight restoration services using specialised equipment and techniques. Our repair system restores headlights with a 2+ year UV-resistant lens coating and to proper NZTA WOF standards.
Conclusion
Maintaining clear and well-functioning headlights is crucial for safe driving, as it ensures optimal visibility during nighttime and adverse weather conditions. Yellowing or fogging of headlights is a natural process resulting from UV exposure, environmental contaminants, and general wear and tear. Thankfully, a variety of restoration methods are available to help you reclaim your headlights’ original shine. Taking proactive measures, you can keep your headlights bright and your driving experience safe. Remember, a little maintenance goes a long way in preserving the clarity and functionality of your vehicle’s headlights.