How To Remove Black Streaks From Gutters

How To Remove Black Streaks From Gutters
  • Author: Amanda Arnold
  • Posted On: November 19, 2021
  • Updated On: August 21, 2023

You might not believe gutters are a noticeable feature of your home, but they are. In reality, everything expresses something, especially those black streaks on your gutters that you have no idea why or how they appeared. It’s critical to keep your gutters in good working order.

You must continue reading if you require assistance in removing black streaks from gutters. Gutter maintenance is important for maintaining the value of your home; they are also important for the appearance of the front of your house.

The cause of black streaks on gutters is oxidation, which implies the substance the gutter is constructed of has faded over time due to exposure to the sun.

When gutters on houses don’t get enough shade to protect them from UV rays, they become chalky if you run your fingers over them after years of exposure, and then these horrible black streaks appear.

Why Are There Black Streaks On The Gutters?

The majority of gutters are composed of aluminum and painted with an anodizing process. They have to ionize the metal for the paint to cling to it, which causes contaminants to connect to the gutter ionically.

The problem arises when pollutants, rain, and sunlight are combined over time. If the roof overflows, smog, dirt, and other particles are released.

Water dribbles down the front of the gutter, carrying smog and debris with it, then dries on the front and stains the gutter. It gets into the gutter with the materials in it and spills into the gutter. The gutter is statically linked to it. Black streaks are known as tiger stripes by gutter specialists because they resemble tiger stripes.

Pressure washing and then using a professional-grade oxidation removal cleaning chemical are the best ways to remove black streaks from gutters.

Why Is It Essential To Remove The Black Streaks?

Water damage to your roof and property can occur if the black streaking on your gutters is not removed. When too much debris is piled up in your gutter system, it might overflow, causing water to leak through your roof and into your attic.

The leaves, twigs, and debris that are constantly deposited in your gutters may cause black streaks. These items can pile up on top of each other and decompose, resulting in a black hue and an awful odor.

Let’s say you keep ignoring the black staining in your gutters. In that scenario, it may result in structural damage to your home’s external walls and foundation, which is not a pleasant sight to see from the outside.

Steps To Remove The Black Streaks

Likely, your gutters are simply unclean, so start with a small portion and a gentle gutter cleanser, water, and a towel. If it’s simply regular dirt, algae, and grime, it should come off fairly easy, but if it doesn’t, you should try cleaning the gutters with specialized zebra stripe-attacking solutions.

1) Pressure Washing

The best way to remove any dirt, mildew, or mould from the surface is to pressure wash the gutters. Bleach is the best way to remove any dirt, mildew, or mould.

Allow a few minutes for the bleach to soak into the gutter. This is somewhat dependent on the weather at the time. Allow three or five minutes for the bleach to settle on the gutters before rinsing thoroughly with low pressure to remove any dirt or derbies.

2) Use A gutter Cleaning Agent

It’s time to grab your gutter brightening product out and start removing the black streaks on your gutters after you’ve cleaned them with bleach and water. Put the cleaning agent in a sprayer and spray a short section of gutters with it.

After that, take a stiff bristle brush and gently scrub the sprayed area, and you should notice that it is becoming cleaner and whiter. After brushing, rinse the area with low-pressure water and continue.

3) Use A Professional Level Product

Follow these methods until your gutters are completely white and free of dark streaks. You will need a professional-grade product that works well to utilize the suitable gutter brightness cleaning chemical. Allow a few minutes for the degreaser to absorb into the surface.

Allow the chemical to dry on the surface but do not allow it to dry completely. Keep the surface moist and the stay duration short if the weather is hot. More dwell time will be required in colder temperatures. The streaks should fade away quickly. Avoid removing the oxidation layer.

4) Call The Professionals

You can always call professionals if your gutters require cleaning and you don’t know how to remove black streaks from gutters. Depending on the extent of the damage, experts can easily and swiftly remove the black streaks from your gutters.

Don’t be embarrassed if you don’t know how to clean black streaks out of your gutters. Professionals guarantee top-notch results when you cooperate with them. You won’t even recall that your gutters had black streaks.


It may be too late if the gutter finish has worn off, there is general discoloration, and the gutters are greying. Your gutter is most likely corroded. If you run your palm across it, and it comes away chalky, you’ve found it.

It will have to be replaced because the gutter cleaner alternatives are ineffective. You’ll need to see genuine stripes to be able to follow this cleaning method. Electrostatic bonding of tar and asphalt from roofing material and other waste to aluminum metal material causes the black streaks.

The procedures outlined above will break down this connection, allowing you to remove undesirable streaks from your gutter easily. These streaks aren’t stains. They’re simply one type of material glued to another.

Avatar photo
Author: Amanda Arnold

Amanda has been working with ConstructionHow since 2021. Her experience spans over 5 years in the creative niche such as home decor and trends, landscaping, renovations, and custom architectural values. As a home designer expert, she has a keen eye for the latest home improvement trends with accurate facts that readers find impossible to ignore. Being invested in home-building trends is how she has gained her lucrative expertise exploring more to bring a positive ambiance for all homeowners (and even tenants!). Currently, she lives in a beautiful beach home, a source of fascination for her.