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Cleaning the solar panels one or two times every month is a good idea. Cleaning the panels early in the morning or at night, when there are no incident sun rays and the power plant is not generating any electricity, is safer. Simply wipe the surface with a sponge, soft nylon brush, or clean wet cloth, being careful to remove any moisture from the panels. Avoid using metal brushes or detergents as they may cause streaks on the panel’s glass.