Understanding and Removing Black Streaks from your Roof

What causes black streaks on roofs?

Many homeowners are dismayed to find dark streaks on their asphalt shingle roof, fearing that it may be dirt, mildew or mold growth. In reality, these stains are caused by a type of bacteria called Gloeocapsa Magma. The growth of this bacteria on shingles is not harmful to humans, but can be unsightly, significantly reducing the curb appeal of your home, as well as destructive to your shingles.

Why is it important to remove black streaks from your roof?

Dark spots often appear on northern-facing or other shaded surfaces that are damp and conducive to bacteria growth. It is often spores carried by squirrels, birds or insects that spread quickly to form black streaks on shingles; left untreated, these streaks can cause further damage to your shingles, ultimately penetrating any structural supports underneath.

How to safely and effectively remove black streaks from your roof?

Many DIY products that claim to remove these stains from your roof often contain bleach or similar harsh chemicals that can harm the environment and actual shingles, paint or vinyl siding at a later stage. Inhalation of bleach could also pose health hazards to humans. So, for your own health, opting for a DIY approach may not be something you want to try. Additionally, any plants or landscaping you may have are also at risk with these over the counter chemicals. This is what makes hiring the roof cleaning specialist at Diamond Roof Cleaning the ideal solution for washing your roof.

Why hire professional roof cleaners?

The quickest and safest way to remove black streaks from your roof is with our specialized soft wash roof cleaning service. Over the course of more than a decade we have perfected our unique blend of eco-friendly detergents so that it goes beyond simply cleaning. It kills bacteria at its source, thereby preventing future outbreaks. In addition, our proven soft wash methods means that while it removes dirt that causes premature aging of shingles and siding degradation, the process itself will never harm your shingles.

Other ways to enhance your home’s curb appeal

In addition to our soft wash roof cleaning, we also offer several other ways to boost the curb appeal of your home. Such as soft wash siding cleaning and pressure washing for concrete surfaces. An unsightly or stained exterior not only reduces its curb appeal, but can lead to many different problems, including the deterioration of the siding and wood trim. So, let us take care of your home’s exterior, and it will take care of you!


Joel Bryan
Joel Bryan
a month ago
It was easy to get a quote and schedule the work. They came out and definitely did a great job of cleaning the house. It is the cleanest it ever was. My only issue is that two of the exhaust fan covers were blown off (?) and no one said anything about it before they left. I did not get the covers back so I assume they were taken away. I'm attaching a picture of one of them. If it was at least mentioned, then I would have given a 5 star review. -Changed to 5 Stars- This is a class A company to deal with. The owner came out and inspected the damage and issued a reimbursement. He also offered to do the installation which was more than I expected. They really do care that their customers are 100% satisfied!
Pamela Banks
Pamela Banks
3 months ago
This is the second time I’ve used Diamond Roof Cleaning to wash my stuccoed home. I’d heard horror stories from others who’d had their homes power washed and questioned the owner, Mike, who gave me addresses of homes similar to mine so I might see his work. I liked what I saw and took a chance with DRC. They did a fantastic job. The workers were friendly, respectful of my property by removing cushions from the patio chairs to keep from damaging/wetting them and answered any questions I had. Now my house looks brand new and I couldn’t be happier.
Robert Widdifield
Robert Widdifield
3 months ago
We recently completed our fourth job with Michael and The Diamond Roof Cleaning crew. This time was cleaning the house and detached garage roofs included. Another beautiful job which started punctually and did not take long to complete. The house is 45 years old with mostly original western red cedar, which comes up looking new when they’re complete. I had started, 4 years ago, to replace the western red cedar on the south and SW corner. The contractor rode by after that cleaning, 3 years ago, and thought I had someone else replace the cedar because it looked new. I’d recommend them to anyone (and have) wishing to clean their house, walls or patios. You won’t be disappointed, I’m surely not.
Diana Bisinger
Diana Bisinger
2 months ago
There are only positive remarks I can make about Diamond Roof. They did a whole house soft clean, washed the windows, and made our stone walkways and patio look like they did when put in 20 years ago. Really! The two gentlemen doing the work were wonderful, too. We had two windows with lots of algae on them and I noticed that they came back to them a few times to wash them over and over again. Would definitely hire them again!
Christine Hucklebridge
Christine Hucklebridge
in the last week
We had the house, roof and gutters cleaned and could not be happier with the results. This is the 3rd time we have used this company and have had a great experience every time. They were on time, professional and make the house look 10x better than when we do it ourselves.

Why Choose Diamond Roof Cleaning

Unmatched Service & Technology

From our state of the art cleaning systems, advanced cleaning methods to insure the best and safest results, to our intensive employee training, you can rest assured that with Diamond Roof Cleaning your home is being treated by the best and most reliable pressure washing and exterior cleaning company in Southern New Jersey! But don't take our word for it, our more than 420 5-star reviews speak for themselves!


There Is Nothing We Can't Clean

Whether your property has vinyl or brick siding. Whether it is a multi-building apartment community or and single family home, the soft washing and pressure washing professionals at Diamond Roof Cleaning can clean almost anything! Amazing results and friendly service and standard with us! We are proud to serve these great communities:

Fully Insured Pressure Washing Service In Southern New Jersey

From Our Blog

The Diamond Standard Of Exterior Cleaning Awaits