Biodegradable cleaner, free from ammonia, phosphates, and petroleum derivatives, per the European directive EC 648/2004 governing detergents in terms of their biodegradability. A specially formulated cleaner for removing dirt and pollutants from solar collectors without affecting galvanized or aluminum surfaces, electrical cables, or other components. It easily eliminates dust, exhaust residues, soot, pollen, mud rain, water salt deposits, as well as bird and bee droppings from solar panels and solar water heater collectors. The accumulation of dust and contaminants on panel surfaces blocks solar radiation, reducing efficiency. Clean collectors ensure optimal performance and longevity of solar systems.