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The best time of year for roof cleaning depends on the climate in your area, but in most cases late spring or early summer are the best times. You should plan to clean your roof when it’s dry and not too hot or cold. It’s also a good idea to clean your roof in the late autumn to remove any built-up debris like leaves or branches. On the other hand, you shouldn’t clean your roof when it’s too cold, because you can cause ice buildup.

Clean the outside of your home at least once a year. If you live in an area with salty sea air, high levels of pollen, or an abundance of leaves in the fall, it's helpful to wash it at least two times a year. Frequent cleanings will allow you to remove debris and pests before they flourish into infestations, or cause mold and mildew.

Yes, cleaning removes harmful elements that contribute to rot or degradation, extending the roof's lifespan and averting costly future repairs.

For the best chemicals to clean a metal roof, stick to gentle detergents such as dish soap, laundry detergent, or car-wash soap mixed in a diluted solution of ¼ cup of soap to 1 gallon of water. These mild cleansers are safe for most roof finishes but are still strong enough to remove remaining dirt particles. Chemicals like bleach or acids can damage your roof, poison landscaping and grass, and pose a hazard to you and your family. If your roof is very dirty or you think it requires chemical cleaning, call a roof cleaning professional.