Common roof cleaning methods like chlorine bleach, the “splash and dash” method, and high-pressure power washing can cause damage to shingles, flashing, and underlayment.
Adam Quenneville Roofing & Siding uses a roof cleaning product called Roof Shampoo®, an eco-friendly solution for asphalt and fiberglass shingles. Roof Shampoo® is a smarter cleaning method that does not use harmful bleach or phosphates and does not require the use of high pressure or scrubbing or brushing. Roof Shampoo® will effectively remove algae, moss and lichens without damaging your shingles or the plants and vegetation around your home.
Ugly but harmless. Black stains on a roof (like in the above photo) are actually from algae. Mostly found in regions with humid summers, algae doesn’t damage the roof, but it will make your roof ugly.