The answer to 'how to clean flashing' is to regularly inspect and clean the flashing around your roof to prevent leaks and water damage. Flashing is the metal or plastic material used to seal the joints and gaps where your roof meets walls, chimneys, vents, and other roof penetrations.
To clean flashing, first inspect it for any cracks, holes, or loose areas. Use a soft-bristle brush and mild detergent or soap and water to gently scrub away any dirt, debris, or corrosion. Avoid using harsh chemicals or abrasives, as these can damage the flashing. Once cleaned, dry the flashing thoroughly and apply a thin layer of silicone sealant to any problem areas to help prevent future leaks.