It is when the headlight plastic turns yellow due to weather corrosion. It Reduces light hence makes driving more dangerous. It also makes your vehicle look old and when it comes to selling the car, having the yellow stain over the lights makes the car seems as it is worth less than the actual value. Spending little on fixing the headlights may result in great amount of money earned when selling.
Note: I do not guarantee it to be 100% like a brand new set of headlights but will definitely look really close to it. Individual results may vary depending on how bad your headlights are. Once i restore your lights, the time it lasts also depends on how you treat your car and how much you drive. My parent's camry started to oxidise 8 years after purchase under normal care but my friend's toyota supra went really bad in 2 years because he left it under the sun constantly
