To clean a roof without destroying the integrity of the shingles you need sh and a surfactant with no pressure.
Sodium percarbonate roof cleaner.
Oxygen powered roof cleaners environmentally friendly non toxic oxygen.
Sodium percarbonate starts to work.
The problem with sodium hydroxide is that if it is not completely removed from the surface even after it has dried it can be activated again and once wet continues its normal chemical reaction on petroleum based products.
Wearing gloves spread the sodium percarbonate by hand over the whole roof.
Roughly a handful 50g will cover 1sqm.
Sodium percarbonate is good for cleaning decks and fences.
Roof cleaning powered by oxygen release from sodium percarbonate solid hydrogen peroxide often called oxygen bleach although it contains no bleach.
You should know that sodium hypochlorite is the chemical name for bleach.
Sodium percarbonate is really easy to use for cleaning stain removal and laundry.
Sodium percarbonate is way to weak for roofs.
Sodium hypochlorite sodium percarbonate or sodium hydroxide for roof cleaning by linda chambers soap warehouse from the may 2012 eclean the best method to clean roof stains caused by algae lichens moss.
Sometimes there is a white residue left which is the by product of the water and oxygen reaction.
But sodium hydroxide is a fine product to use for cleaning tile concrete or slate roof materials.
Water activated roof wash ox is hydrogen peroxide based oxygen roof mold and algae cleaner that cleans using the power of oxygen for roof mold stain removal.
Most products come with a chart that shows how much to use.