The Circular Polariser
Look at the side of the car. It was photographed in bright November sunlight, so the side of the car, fully exposed to the sunlight, should be overexposed in comparison to the rest of the vehicle. On this image, a circular polariser filter was used n the lens of the camera, eliminating the effect of the UV rays on the highly polished surface of the car.

My filter is made by HOYA. Here’s an extract from their website:
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