The reason could be a number of things.
Black streaks gutters.
All gutters are painted metal and over time water run off will start taking away the top layer of paint where the streaks are.
How to get black streaks off gutters fascias step 1.
Climb up the ladder and.
Set up a ladder at one end of the gutter and fascia where the black streaks are located.
These black streaks are usually caused by an overflowing of your gutter.
The black streaks are a result of electrostatic bonding of tar asphalt from roofing material and other debris to aluminum metal material.
Fill the spray bottle with gutter cleaner.
Application method spray on after diluting pump up sprayer or spray bottle allow to work for up to 5 minutes keep wet by misting scrub with a brush or rag rinse and repeat if necessary.
Although these dark spots and ugly black streaks on your roof may look like dirt mildew soot or mold what they really are is algae.
The most common type is known as gloeocapsa magma also known as blue green algae.
Streak getter will break down this bond which will allow you to remove the unwanted streaks off your aluminum gutter with little effort no scrubbing.
Or grab a ladder that can remain stable while scrubbing.
Shut the bottle tightly and turn the nozzle to the on position.
Usually there is too much water from the roof for the gutter to handle.
Gutters made 15 years ago are much higher quality than the ones made today.
This algae growth usually begins as small spots and then eventually becomes visible streaks.
These older gutters have quality paint and even when they re not cleaned for 5 years they can be restored to look like new.
Depending on the heat type of.
No matter which degreaser you choose always start by thoroughly watering down the surrounding vegetation.