Headlight cleaners and restorers are formulated with specific properties to counteract the degradation of polycarbonate lenses (the plastic that most modern headlights are made of). This degradation is primarily caused by UV radiation (oxidation), road grime, and environmental contamination.
Here are the key properties of these products:
1. Oxidation Removal Power
- Property: The ability to break down and remove the yellowed, hazy layer of oxidized plastic that impairs light output. This is the core function of a restorer.
- Chemical/Mechanical Action:
- Chemical Agents: Products may contain acids (e.g., citric acid, oxalic acid) or solvents (e.g., isopropyl alcohol (IPA), terpenes, mineral spirits) that chemically dissolve the oxidized plastic polymers.
- Abrasive Agents: Polishes and compounds contain micro-abrasives (e.g., alumina, silica, cerium oxide, or even diamond powder nanoparticles) that mechanically sand or buff away the damaged layer.
2. Abrasive Capability
- Property: Refers to the “cutting power” or grit size of the cleaner. This determines the severity of damage the product can correct.
- Low Abrasiveness: Found in maintenance polishes and fine-cut compounds (like those in a final polishing step). They remove light hazing and fine scratches without the need for sandpaper.
- High Abrasiveness: The primary mechanism in sanding-based restoration kits, using graded sandpaper (e.g., 800 to 3000 grit) to remove heavy yellowing and deep scratches. The polishing compound that follows is still abrasive but is designed to remove the sanding marks.
3. UV Protection and Sealing
- Property: The ability to form a new, durable, transparent layer that shields the restored lens from future sun damage. This is critical because the original UV coating is removed during restoration.
- Chemical Agents: Polymer sealants, acrylic urethanes, or ceramic coatings are applied as the final step. These components cure to form a hard, UV-resistant barrier, which is essential for long-term clarity.
4. Degreasing and Contaminant Dissolving
- Property: The capacity to lift and remove road grime, grease, bug splatter, and mineral deposits that accumulate on the lens surface.
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Chemical Agents: Surfactants (detergents) and specific organic solvents (like citrus terpene or mineral spirits) are used to break down hydrocarbon-based residues (grease, tar, road film) so they can be easily rinsed away.
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