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It may require stronger cleansers or chemicals, higher-pressure spray, or scrubbing to completely remove algae from a metal roof. Start with a mild cleanser; if that doesn’t work and you're comfortable doing so, use a stronger mix of ⅓ cup of laundry detergent, 1 quart of bleach, and 3 quarts of water to gently scrub the algae with a soft-bristled brush. If algae is present across large portions of your roof, doesn’t come off with gentle scrubbing and cleansers, or is in hard-to-reach areas, this may be a job better left to a pro.

You may become so frustrated with the look of moss on your roof that you contemplate whether to clean or replace your roof. Fortunately, you don’t have to go as far as replacing it. After cleaning the moss, you can use a chemical solution to keep it away. For further protection, trim branches that overhang the roof, as fallen seed pods and leaves on the roof allow moisture to collect, encouraging moss growth. Consider adding zinc-coated flashing to the roof, too. As rain washes across the zinc, it leaves zinc particles behind that inhibit moss growth.

Walking on the roof to clean gutters is unsafe and not recommended due to significant safety risks. It is especially dangerous on steep or slippery roofs, or if the roof is wet or covered in leaves, which increases the chance of a fall. In addition to personal injury, walking on the roof can damage shingles, potentially leading to water leaks. Instead of walking on the roof, use a sturdy ladder positioned on a stable surface to access the gutters. Be aware that using a ladder also carries risks, as it can be difficult to maintain balance while performing the work. You can also use ground-based cleaning tools. For safety reasons and to prevent damage to your roof, hiring a professional to clean your gutters is the best and safest option.

Inspect annually for damage, clean debris, and reapply sealant to maintain protection.