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No, asphalt shingles should not be power washed. A power washer or pressure washer is too strong to use on asphalt shingles and will loosen the adhesive holding them to your roof, causing them to fall off. It’s best to hire a local roof cleaner to clean those shingles safely and without damaging them. 

The best time to clean the outside of your house is during your outdoor spring cleaning. Wait until late spring, after the wave of pollen is done coating your home. You can also wash your house in late fall–before the first freeze–to remove leaves and branches from the gutters.

Moss grows in dark areas of roofs, including in corners and gutters. If left alone, it can grow under roofing and cause permanent damage. Here’s how to remove moss from metal roofs: 

• Soak the moss to soften it

• Scrub it away with a soft-bristled brush, or pick it off with your hands (be sure to wear gloves)

• Use a moss remover that’s compatible with metal roofing, following the manufacturer’s directions

• Remove dead moss and rinse the roof thoroughly

• Prevent future moss growth by trimming branches, cleaning gutters, and attaching zinc strips to moss-prone areas

If you wish to forego painting your shingles but still want to give them a fresh look, a deep cleaning is the first step. Clean off any debris from your roof and gutters, and then power wash your shingles to get grime and algae off. To take things one step further, you might even consider installing new gutters to give your home a bright new look.