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You may become so frustrated with the look of moss on your roof that you contemplate whether to clean or replace your roof. Fortunately, you don’t have to go as far as replacing it. After cleaning the moss, you can use a chemical solution to keep it away. For further protection, trim branches that overhang the roof, as fallen seed pods and leaves on the roof allow moisture to collect, encouraging moss growth. Consider adding zinc-coated flashing to the roof, too. As rain washes across the zinc, it leaves zinc particles behind that inhibit moss growth.

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.

The best time of year for roof cleaning depends on your local climate, but generally, late spring, summer, or early autumn are ideal. Plan to clean your roof on a day with dry weather and moderate temperatures.

Late spring and early summer are excellent for cleaning off grime accumulated after a snowy winter or wet spring. Summer often provides the necessary dry conditions, though in very hot climates, late spring may be more comfortable. Alternatively, cleaning in late autumn can clear away debris like leaves and branches before winter.

Avoid cleaning your roof when it is cold enough for water to freeze, as this can cause dangerous ice buildup.

Long-handled telescopic brushes are the best way to clean the outside of a house without a pressure washer. There are even special attachments for cleaning the outside of windows. Use a gentle cleaning solution for both the roof and siding to avoid harming the finishes. Be sure to rinse the area thoroughly with a garden hose after scrubbing.