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Solar panels are an efficient renewable energy technology that reduces conventional energy dependence by converting sunlight into electricity. However, to maintain their efficiency and longevity, solar panels must be cleaned regularly. Dust, dirt, leaves and even bird droppings on the surface of solar panels can block sunlight, thus reducing the output of electricity. Cleaning solar panels is critical to maintaining their peak performance. Studies have shown that uncleaned solar panels can lose anywhere from 5% to 25% of their efficiency. This loss of efficiency depends on the environment in which the panels are located and how much dirt they have accumulated since they were last cleaned. For example, solar panels in arid and dusty areas or near highways and industrial areas may require more frequent cleaning.