For cleaning solar panels, it is recommended to use clean, soft water to prevent any scratches or damage to the panels. Hard water or water with high mineral content can leave deposits and stains on the panels, reducing their efficiency. Ideally, distilled or deionized water is best for cleaning solar panels, as it contains no minerals or other impurities.
If distilled or deionized water is not readily available, you can use tap water that has been filtered or treated to remove impurities. Alternatively, you can collect rainwater and use it to clean your solar panels, as rainwater is typically free of minerals and other contaminants.
It is important to avoid using detergents, abrasive materials, or high-pressure water jets when cleaning solar panels, as these can damage the surface of the panels and reduce their efficiency. Instead, use a soft sponge or cloth and a mild soap solution if necessary.