How Black Roof Can Be Cleaned:
The black stinks on roof mostly found in the areas where moisture settles on shingles.
There are lots of roof cleaning methods with advantages and disadvantages.
B - Sodium Hydroxide based cleaners are generally advertised as safer for the landscaping, but sodium hydroxide is caustic, very toxic, and care should also be used to protect employees and surrounding property. Sodium hydroxide is also a very effective degreaser. So high levels of sodium hydroxide in a cleaning product can cause damage to an asphalt shingle roof that can be irreversible.