Most commercial headlights are made of a clear and durable plastic material. They are designed to be transparent and sturdy. Additionally, these headlights are treated with a UV film coating to enhance their resistance to intense heat from the sun and their own powerful bulbs. However, there are two issues with this construction.

Firstly, like many types of plastic, the material used for headlights is slightly porous. This means that small particles of dirt, dust, and other debris can become trapped inside the headlights. Secondly, the UV film gradually wears down over time due to exposure to heat and general wear and tear. As a result, the headlights become foggy and the lighting output is significantly reduced. Although it may be possible to remove some of the debris by wiping the headlights, in most cases, the buildup will be stubbornly stuck.