Why do gutters get black streaks?

Dirt and algae carried down the face by runoff. They're common in humid climates.

Can black streaks be removed?

Usually, with the right cleaner and a soft brush. Heavily oxidized finishes may only improve.

Do I need to replace stained gutters?

No. Staining is cosmetic and cleans off in most cases.

Gutter Exterior Cleaning & Brightening Streaks and Algae Off the Face

The dark vertical streaks on a gutter face are dirt and algae carried down by runoff, and in Florida's humidity they come back fast. They're cosmetic, and they don't mean the gutter is failing. Brightening cleans the outside of the gutters and downspouts with a gutter-safe cleaner and a soft brush or low-pressure wash, and it often takes a house from looking neglected to looking maintained without replacing anything.

Cost & Scope

Exterior cleaning typically runs $120 to $350 depending on linear feet and the number of stories. It's often booked together with an interior gutter cleaning at a lower combined price.

Heavy oxidation, where the finish has chalked, may not clean fully. The installer tells you what's realistic before starting.

Cost Range

$120 – $350

Timeframe

1–3 Hours

Warranty

30-Day Warranty

Get a Free Gutter Exterior Cleaning & Brightening Estimate

Written, in-person, no obligation.

Important Considerations

What to know before booking:

Finish condition — a baked-on finish cleans well. A chalky, oxidized one may only improve.
Pressure — high pressure can strip the finish. Soft washing and hand brushing are safer.
Bundle with cleaning — both jobs use the same ladder setup.
Runoff staining — streaks return if the roof above is shedding algae or debris.

Ready to See This Done Right?

Free written estimate, no pressure.

Materials We Use

What the crew uses:

Gutter-safe cleaner

Soft brushes and sponges

Low-pressure wash system

Ladder stabilizers

Drop cloths for landscaping

Our Process

A four-step visit:

01
Test a Spot
Cleaner tried on a hidden section to confirm it's safe for the finish.
02
Apply Cleaner
Gutter and downspout faces treated.
03
Brush & Rinse
Streaks brushed off and the surface rinsed clean.
04
Walkthrough
Results checked with you.

Get Your Project Scheduled

How to Choose a Provider

What to check:

Low Pressure

Ask how they clean. A pressure washer can damage a baked-on finish.

Spot Test

A good crew tests a hidden section first.

Guarantee & Support

Written Workmanship Warranty

Every project is backed by a workmanship warranty in writing. If a seam leaks or a section pulls away from application error within the term, the installer comes back at no charge.

Licensed & Insured

Every installer in our network carries liability and workers' comp coverage, verified before they're matched with a homeowner. Details are available on request before you book.

Fixed Written Estimate

The number in your estimate is the number you pay, unless you change the scope yourself mid-project.

Daily Site Cleanup

Old gutter sections, cut-offs, and fasteners hauled away before the crew leaves, every day of the project and not just the last one.

Why Choose Gutters Kingdom

Brightening is cosmetic. If your gutters are sagging or leaking, cleaning the outside doesn't fix them, and we'd point you to a repair instead.

Gutter-safe cleaner, tested first
Low-pressure methods that protect the finish
Honest about what the finish can recover

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