How to remove black streaks from shingles?

Spread across your shingles are black streaks that seem to be crawling down the roof. Black mold stains on roof shingles have become common on houses in every price range and neighborhood. What causes roof shingles to streak?

What can I do to get rid of roof stains? Is Power washing roof shingles smart or is the pressure from the wash going to damage the granules on the shingles?

We’ll explore the answers to these questions as we explore how to remove dark stains from roofs.

What are the black streaks on my roof?

Many home owners are surprised to discover that the once clean asphalt roof shingles have been slowly covered with a form of roof mold or mildew that appears as a light discoloration and spreads down the roof toward the gutters. The black roof stains are caused by a form of algae that has been around for years, typically found in the woods on the north side of trees, or on exposed rocks; but now this black algae is termed a roof shingle algae because of the annoying discoloration on a asphalt shingle roof.

The roof algae (sometimes called a roof mildew or shingle mold) actually feeds on the crushed limestone that is present in shingles from most asphalt shingle roof manufacturers. The roof algae is spread by wind and animals from roof to roof and is almost impossible to prevent.

How an black roof stains be removed from shingles?

The good news is: Yes, Roof Stain removal is possible!
Choose between two common roof cleaning solutions used to :
do it yourself roof cleaning using a roof cleaning product, or using roof cleaning services from a professional roof cleaning business.

The difference between the roof cleaning company and DIY roof cleaning is cost, and results.

Hire a Roof Cleaning Business

A roof cleaning business has experience at the shingle cleaning techniques and appropriate pressure to use with roof wash products. Pro roof cleaner’s years of experience will typically result in more complete removal of roof stains.

Do It Yourself Roof Stain Removal

Search for “Roof Cleaning Products” to find roof cleaner suppliers who offer roof cleaning chemicals, but be careful to know the company and what products they offer.   Trust roof cleaner supply companies that offer multiple formulas, and preventive solutions as well. Over the years we have found Roof Cleaner QSE and Roof Shingle Cleaner OX to be quality products with thousands of customers every year.

When you clean your own roof shingles be prepared to set aside an afternoon, and get your ladder out. There is no magic bullet when it comes to Roof Cleaning, and you will at least need a ladder to get up to the level of the gutter. The closer you are to the roof stains, the better your Roof Stain Removal Products will work.

So black stains on roofs can be removed, just choose a quality roof cleaner product or your local roof cleaning professional and make your roof look better!


  1. fred coutts September 7, 2009
  2. Tom Breen March 5, 2010
  3. steve May 13, 2010
  4. Cleaner Today Guide May 19, 2010
  5. Dan Cronauer November 28, 2012
    • Cleaner Today Guide March 31, 2013
  6. Gary Montgomery March 30, 2013
  7. Gary Montgomery March 30, 2013
    • Cleaner Today Guide March 31, 2013
  8. Jonathan K October 24, 2013
    • Cleaner Today Guide June 3, 2014