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It may require stronger cleansers or chemicals, higher-pressure spray, or scrubbing to completely remove algae from a metal roof. Start with a mild cleanser; if that doesn’t work and you're comfortable doing so, use a stronger mix of ⅓ cup of laundry detergent, 1 quart of bleach, and 3 quarts of water to gently scrub the algae with a soft-bristled brush. If algae is present across large portions of your roof, doesn’t come off with gentle scrubbing and cleansers, or is in hard-to-reach areas, this may be a job better left to a pro.

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. 

You should not use a pressure washer on any surface that it might damage. Examples include shingled roofs, glass, electrical components, and anything with a seal that might be stripped away by the pressure. There are a variety of different uses for a pressure washer . They're ideal for driveways, patios, garage floors, vehicles, fencing, gutters, and paint stripping.

Even though you don’t look at your roof often, there are some telltale signs that you should have your roof professionally cleaned. It’s best to hire a professional roof cleaner as soon as you notice signs of wear and tear to preserve the essential feature’s longevity. Some indicators to look out for include:

• Leaf buildup in gutters

• Dirt and grime buildup

• Moss or black algae growth

• Dirt buildup under shingles

• Shifting roof shingles

• Plant growth