Just pour or spray the white vinegar in the affected area and let it sit.
Home remady to kill mold on roof.
These stains will discolor your roof and damage the shingles over a period of time if left alone.
Comes in a number of formulations one specifically for roofs and others designed to remove and or inhibit moss and fungus growth on siding masonry surfaces and even lawns.
Mold stains can form on roof shingles that are in permanent shade.
To keep the algae from coming back insert 6 inch wide strips of zinc or copper under the row of shingling closest to the roof peak leaving an inch or two of the lower edge exposed to the weather.
When leaves and other material collect on your roof a perfect bed is formed for moss and lichens to grow.
Do not rinse the area once the vinegar has dried up.
Moss itself is a plant while lichen conisist of a fungus and a photosyntheizing plant living together.
Although a bit expensive the grapefruit extract is known for giving effective and long lasting results.
Also grapefruit extract works well on all kinds of surfaces and can kill all mold species without the corrosive smell or any side.
Extensive mold growth can also expose the interior of your attic or crawlspace to mold spores carrying the problem over to the inside not to worry though because you can clean the mold off with basic household bleach and save.
Remove moss and lichen from your roof with vinegar.
After a few hours the mold and the acidic smell from the vinegar will disappear.
Their formulae use tried and true zinc compounds that linger on surfaces to provide continuing protection from fungus regrowth.