A solar cleaning guide outlines practical steps to keep photovoltaic panels operating at peak efficiency: begin by scheduling inspections every 6–12 months and after major storms to check for dirt, bird droppings, shading, or physical damage; use soft-bristled brushes, microfiber cloths, or low-pressure water rinses to remove grime—avoiding high-pressure washers and abrasive materials that can scratch panels; clean panels early morning or late afternoon when surfaces are cool to prevent thermal shock and streaking, and use deionized or distilled water where mineral deposits are a concern; follow manufacturer recommendations regarding cleaning agents and safety procedures, including securing ladders, wearing fall protection, and de-energizing systems when required; consider professional cleaning for large arrays, steep roofs, or heavy soiling to ensure thorough, safe service and to preserve warranties and long-term performance.