How to get rid of algae on the roof you could replace all the roofing with new shingles dark enough to disguise the staining or with shingles laced with copper granules which are lethal to algae.
How to get moss off roof youtube.
But that would only make sense if the shingles were worn out.
As seen on amazon.
How to remove roof moss fast before it damages your shingles.
Climb up to the roof and begin scraping off dead moss from the shingles using a putty knife or painter s 5 in 1 tool and working from the bottom up.
Removing moss from a roof can seem like a difficult task some people reach for the pressure washer but often you can clean the roof simply using a stiff bru.