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Roof cleaning can damage shingles if it’s done incorrectly—like with a high-power power washer—but it likely won’t damage your roof if you pay to have an expert do the work. A professional roof cleaner will use a gentle cleaning solution and a cleaning method that matches your roof material to ensure the process doesn’t damage the roof. Some homeowners worry that roof cleaning will shorten the life of their roof by removing shingle particles or protective coatings, but it often extends roof life by removing plants that cause damage and improves your home’s curb appeal simultaneously.

You could void your roof warranty using a power washer if you have a newer roof. With an older roof, you could knock loose older shingles. On the other hand, some people safely use a pressure washer to remove moss from a metal roof. Although you may want to use a pressure washer, the truth is that you probably don’t need it to knock moss loose. A garden hose and brush will do the job just fine and in a safer manner than a pressure washer.

Both bleach and vinegar are effective at killing and removing moss from surfaces like driveways. Bleach tends to have a longer-lasting effect, potentially keeping moss away for up to a year, whereas vinegar may require more frequent applications. However, vinegar is a non-chemical option that is gentler on the environment. A key consideration is the surface you are treating, as both substances can stain or discolor certain paver materials. It is recommended to test the solution on a small, inconspicuous area first to ensure it doesn't cause damage.

Roof cleaning isn’t a necessity, but it can drastically improve your home’s curb appeal and even prolong the life of your roof, so it’s often a great investment. It’s especially a good idea if shaded parts of your roof experience algae or moss growth, which can damage the shingles and hold water against them, increasing the risk of a roof leak.