Clean with the rain roof cleaning chemicals
I have developed improvements for Spray and Forget types of products!
If using these Quat based products, here is what you do.
Simply add 1 - 8 oz cup of Rock Salt per gallon of mix. The added Salt will also help the Quat kill the algae faster.
But more importantly, the added Salt will dry the dead algae out like beef jerky, making it rinse away even faster!
Of course, either Tarp or water the plants before, during, and after the roof treatment, or the added Salt will kill or brown the plants around the house, just like bleach.
These products rely on the rain to clean the roof, and Trees stop the force of the rainwater.
Be aware of this guys!