No, you don't need to turn off solar panels to clean them. Solar panels are designed to be weather-resistant and can be cleaned while they are operational. However, it's important to be careful when cleaning solar panels to avoid damaging the panels or electrical connections. It is recommended to use gentle cleaning methods and equipment, such as a soft-bristled brush or microfiber cloth and a mild soap solution, and to avoid using high-pressure water or harsh chemicals. It's also important to follow all safety guidelines, such as wearing gloves and goggles, and to use a ladder or extension pole if necessary, to prevent accidents while cleaning the panels. If you are unsure about cleaning your solar panels, it is best to consult with a professional solar panel cleaning service.