There are some DIY methods for cleaning solar panels, which primarily involve using water and soft brushes or sponges. The time required to clean a set of solar panels depends on their size and accessibility, but it usually takes a few hours. Rainwater alone can help remove light dirt and dust, but for thorough cleaning, using a combination of water and gentle scrubbing is recommended. However, caution should be exercised when using rainwater, as it may contain minerals or pollutants that could leave residues on the panels. Abrasive materials should be avoided as they can scratch or damage the panels' surface, potentially reducing their efficiency. For more information on DIY cleaning methods, refer to this article: httрs://a1solarstore.com/blog/how-to-clean-solar-panels.html.