The Best Best Chemical To Clean Metal Roof 2022. Detergents such as laundry soap , mild dish soap and car washing soap are all good. Safe on brick, wood, siding, cement, stone, fabric, roofs, and more.

1/3 cup of powdered laundry detergent + 1 quart of bleach (5% solution) + 3 quarts of water. Then, you’ll just need to apply to solution to your metal. Metal roofs can be cleaned by pressure washing them.