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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 can rinse your solar panels in some cases. For example, periodically rinsing your solar panels can remove light debris if you live in an agricultural or dusty area. Light dust and dirt won’t affect efficiency much, but they can build up and mix with other debris like animal droppings, leaves, and small sticks. 

A professional roof cleaning lasts about a year on average, so it’s best to do it annually. This schedule helps catch any roof problems before they become extensive and helps prevent mold, moss, and algae from forming. If you live near the coast, annual roof cleaning will help prevent salt buildup on your roof. You can add professional roof cleaning to your yearly home maintenance checklist to ensure you never miss a year.

In most cases, it is best to leave icicles on your roof and allow them to melt naturally. You should only remove them if they are heavy enough to cause damage to your home or pose a safety risk to people below. Attempting to remove icicles yourself can be dangerous, so if you are concerned about immediate damage, it is recommended to hire a professional. To prevent icicles from recurring, you should address the underlying cause, which is often poor insulation. Long-term solutions include improving your home's insulation or installing roof heating coils.