If it is too late to prevent algae treat the problem instead.
Roof algae cleaning solution.
Put in a spray bottle to apply to small patches.
The less expensive solution is to spray wash the roof with a 50 percent mix of water and bleach to get rid of the algae.
Wet forget roof and siding cleaner for easy removal of mold mildew and algae stains bleach free formula 48 oz.
They re likely to damage the shingles just be sure to wet your foundation plantings first and rinse everything in clean water when you re done.
No pressure washers please.
Also there are other related expenses which amounts to a pretty significant number most of the times.
Spray forget revolutionary roof cleaner concentrate removes stains caused by algae mold and mildew this concentrated roof cleaner saves time with no rinsing required great for outdoor use on asphalt shingles wood shingles slate shingles and clay tile shingles.
Trying to diy roof algae cleaning with solutions such as bleach and water could lead to expensive roof leaks or further moisture getting trapped beneath your shingles.
Do not attempt to remove algae from your roof alone.
For a larger more involved surface area pour the formula into a pump sprayer.