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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.

Walking on the roof to clean gutters is unsafe. If you do your own gutter cleaning, use a ladder to reach the gutters rather than climbing on your roof. Walking on the roof is dangerous, especially if it has rained recently or if there are fallen leaves. You can also damage your shingles when walking on them, which can lead to water leaks.

Keep in mind that using a ladder has its risks, too. It can be difficult to keep your balance while doing the labor-intensive work of cleaning gutters. For safety reasons, hiring a pro to clean your gutters is the best choice.

Vinegar, bleach, chlorine, barley straw, and a bevy of dedicated algaecides can kill algae, which is the easy part. Preventing algae from returning can be a struggle for some homeowners, but keeping the patio well-maintained and clean is a good first step.

Chemical herbicides will kill moss permanently. The same goes with bleach water. However, moss can start growing again once a new layer of dirt and debris is caught in your sand in paver joints. Therefore, the problem is not about killing moss permanently, but ensuring effective prevention of moss regrowth.