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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.

You should clean your panels at least twice a year. It depends on your location. In dusty climates (think the Arizona desert), you may need to clean your panels more frequently. Dust can dramatically impact the electrical output. If you live in a climate with extreme weather, you may want to check your panels seasonally.

Soft washing chemicals typically consist of a mix of sodium hypochlorite (or a chemical component of bleach) and water. While sodium hypochlorite and bleach are often thought to be the same thing, there is one small but key difference between the two: sodium hypochlorite comes in powdered rather than liquid form, which means that it’s also more concentrated and more effective from less product overall.

If you’re painting your home or monitoring a job as it’s being completed, squash the issue ASAP if you notice paint is getting onto the roof. Keeping it clean is one of the keys to extending your roof’s life.

Removing latex paint before it dries is much easier and lowers the risk of damaging your shingles (more on that below). Simply spray the spot with a hose for one to two minutes to clear away the drying paint. In general, this is a good way to remove ugly stains from your roof without using chemicals.