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Iron, or ferrous sulfate, is one of the fastest methods for killing moss. As such, you’ll find this ingredient in many lawn fertilizers and lawn killers. Vinegar is another solution for quickly killing moss. It takes just 15 to 20 minutes for vinegar to take effect. A harsher method is bleach, which also has a similar time frame for taking effect.

Yes, pros use specialized solutions and pressure settings tailored to surface sensitivity.

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.

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.