How to price roof cleaning jobs
Roof Cleaning Average Costs. The actual cost of roof cleaning depends on your location, the complexity of the job (i.e. roof size and pitch and the height of your home), and other factors. The following prices are only general estimates.1  On average, roof cleaning pricing is $.15 to $.30 per square foot, or $15 to $30 per square (a square, in roofing terminology, is equal to 100 square feet). 2  For an average-sized roof of 1,500 square feet (15 squares), that s a total cost of approximately $250 to $500.oof Cleaning Basics. The stains on your roof are probably caused by a type of algae known as Gloeocapsa Magma. Transported through the air by spores, Gloeocapsa can grow on any type of roof in any climate, though it is more prevalent in the Gulf States and other areas with warm, humid climates.