PV module cleaning is the industry term for professional cleaning of photovoltaic solar modules. It refers to the specialized process of removing soiling, dust, biological deposits, and other contaminants from the glass surface of solar panels using equipment and techniques designed to protect the module while restoring maximum light transmission and energy output. The goal is to return each module’s soiling ratio as close to 1.0 as possible, meaning zero light-transmission loss from surface contamination.