The answer to 'how to clean flat roof' is to regularly clean and maintain your flat roof to prevent debris buildup, leaks, and other issues. This typically involves sweeping, washing, and inspecting the roof surface on a periodic basis.
Start by using a soft-bristle broom or leaf blower to remove any loose dirt, leaves, twigs, or other debris from the roof. Then, use a mild detergent and water to scrub the surface, focusing on any areas with visible stains or grime. Rinse thoroughly with a garden hose to remove all soap residue. Finally, inspect the roof for any cracks, holes, or signs of wear, and address any issues promptly to prevent more serious problems down the line.