Re roof an expensive option.
Roof stains away.
Algae can be killed and the stains removed using chemical cleaners though they usually return over time.
Roof cleaning contractors who use sodium hypochlorite chlorine bleach mix it in high concentrations with other chemicals such as trisodium phosphate also known as tsp.
Green roof stains on roof shingles clay tiles cement tiles and asbestos cement roof shingles or newer fiber cement.
Extractive bleeding stains on asphalt roofs see extractive bleeding on shingles and see roofing material defect.
They spray it on the roof and wait for it to dry and then re apply it several times as needed.
Use a cleaner specially made for killing algae or by spraying a mixture of one part bleach to four parts water with tsp trisodium phosphate or other detergent added in a garden pump up sprayer.
1 gallon of hot water 1 full cup of chlorine bleach 1 cup of powdered laundry soap.
Here s the recipe for creating the perfect bleach solution.
Apply roof be clean just spray it on after proper dilution as directed with an.
Lichens growing on building surfaces lichens are not the.
Your roof likely has more useful life.