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.
Roof algae cleaning solution.
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.
Also there are other related expenses which amounts to a pretty significant number most of the times.
The second method is to spray on a coating of stain blocking solution defy stain blocker for roofs is one product but there are other brands as well a stain blocking product can buy you up to three years of protection from algae.
Put in a spray bottle to apply to small patches.
It could also put you at health risk if you re not careful.
Do not attempt to remove algae from your roof alone.
No pressure washers please.
For a larger more involved surface area pour the formula into a pump sprayer.
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.
A homemade cleaning solution can be mixed using a quart of chlorine bleach and a gallon of water with one fourth of a cup of trisodium phosphate stirred in.