1. Use elbow grease and a long-handled scrub brush to scrub moss away. Avoid using a pressure washer as the intense pressure can remove granules from shingles and/or cause them to loosen.
2. Use a diluted bleach and water solution (1:1), and apply directly to moss. Let it sit for 20 minutes or more and then rinse off with low-pressure water. Wear protective clothing including gloves and glasses or goggles. Avoid spilling runoff near edible plants.
3. Sea salt and hot water is a low-tech approach that is safe for plants and surrounding vegetation. Spray saltwater mixture on moss and let sit 20 minutes. Scrub off loosened greenery. You may need to repeat this process for a few cycles.
4. Zinc chloride is an effective moss removal agent yet it can damage surrounding vegetation. Use prior to fall rains or in early spring to avoid run-off into public water supply. Zinc chloride can be used in 62% or 13% concentrate. The 13% concentrate requires no water, so apply this directly. If using the higher concentrate, dilute as directed.
5. Prevent moss before it gets a toehold. When installing a new roof, choose moss resistant shingles. These shingles are crafted with copper granules (10%), as copper naturally hampers algae growth.
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