What Are Those Black Streaks on My Roof & How Soft Washing Can Help?

Roofs are not immune from the effects of time and weather. Inevitably, your roof will be stained from dirt, algae, and other organic growth, especially if it has been exposed to moisture for long periods or is often in shady areas. Roof cleaning can be a major chore, and the black streaks which often appear are tough to remove.


Soft washing is an effective way to remove those black streaks from your roof. This method uses cleaning products mixed with water and is delivered under low pressure. Read on to understand more about soft washing your roof and how it can help.

What Are Black Streaks and How Are They Formed?

Black streaks on roofs are caused by a type of algae called Gloeocapsa magma. This organism grows best in warm, humid climates and thrives off the limestone found in many roofing materials. As it grows and reproduces, it leaves behind dark stains along your roof’s surface. In addition to its unsightly appearance, black streaks can damage your roof’s shingles. The algae feed on the protective granules of asphalt shingles, causing them to deteriorate and become brittle over time.

What Is Soft Washing?

Soft washing is cleaning your home’s exterior using gentle detergents and low-pressure water to remove dirt, grime, and contaminants from surfaces like roofs. Soft washing is different from power washing as it doesn’t involve using high-pressure jets of water, which can cause damage to more delicate materials like asphalt roof shingles.

Soft washing removes black streaks from your roof, removing the algae and other contaminants that cause the streaks without damaging the roof’s surface. Soft-wash detergents are specially formulated to break down organic materials like algae and moss so that they can be rinsed off your roof with low-pressure water.

Benefits of Soft Washing

Soft washing is an effective method for removing black streaks from roofs. Unlike power washing, which uses high pressure to blast away dirt and debris, soft washing uses a low-pressure spray of biodegradable cleaning solutions to gently and safely remove contaminants. This method helps protect the integrity of your roof’s shingles and prevent further damage. Soft washing also helps to preserve the aesthetic appeal of your roof by removing signs of aging, such as moss, lichen growth, mold, and black streaks.

Additionally, soft washing is more efficient than power washing since it requires less water pressure. This means that the cleaning process is much quicker and uses less water, making it an environmentally-friendly option. Soft washing also helps extend your roof’s life by preventing future contamination from forming on its surface. Finally, soft washing is often more cost-effective than power washing since it requires fewer materials and does not damage your roof’s shingles.

Soft washing offers a safe, efficient, and cost-effective way to remove black streaks from the roof. Its low-pressure spray helps preserve your roof’s integrity while removing contaminants and preserving its aesthetic appeal.

For premier roof cleaning services in Alpharetta, GA, Cumming, GA and Johns Creek, GA, contact Aqua-Nomics. With our expertise and state-of-the-art equipment, we’ll rejuvenate your roof, leaving it looking brand new. Our highly trained cleaning team guarantees a safe and effective cleaning process.