What is the soiling of solar panels?

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"Soiling of solar panels refers to the accumulation of dust, dirt, and other debris on the surface of the panels. This can include things like pollen, bird droppings, and even particulate matter from the air. The soiling can occur naturally over time, but can also be exacerbated by factors such as location (e.g. near a construction site), weather conditions (e.g. high winds), and the type of surface on which the solar panels are installed. The soiling can reduce the efficiency of the solar panels by blocking sunlight from reaching the cells and preventing them from generating electricity to their full capacity.