Tiger Stripes Are Oxidation · Different Chemistry · Different Result
Gutter Brightening — When A House Wash Isn't Enough.
The Gold Standard, Every Time.
The black vertical streaks on the face of your aluminum gutters aren't dirt. They're aluminum oxide bonded to the paint film by years of acidic rain runoff. House-wash hypo doesn't lift them. We use a brightener — an oxalic-acid-based chemistry — that dissolves the oxide and restores the white. Different chemistry, same trained crew, often the same visit.
What You're Actually Looking At
Gutter "tiger striping" has a chemistry, and the chemistry is acid.
Aluminum gutters develop a thin oxide layer naturally — the same oxide that protects raw aluminum from corrosion. When acidic rain runs across that oxide and dries repeatedly, it bonds organic carbon and atmospheric pollutants into the surface in vertical bands matching the rain's flow lines. The result is the dark streak running down the face of every aluminum gutter on every poorly-maintained NE Florida home. Hypochlorite chemistry — the chemistry that handles mildew on siding — has zero effect on aluminum oxide. The right chemistry for this is an organic acid, typically oxalic, blended into a brightener system. The acid releases the oxide bond, and a low-pressure rinse carries the residue off. The gutter face restores to factory white. Hardware-level fix, in 30 minutes per side.
FCPE Gutter Brightening
- Oxalic-acid-based brightener at controlled concentration
- Hand-applied with brush or low-pressure foam
- 2–4 minute dwell — acid releases oxide bond
- Low-pressure rinse, neutralized with fresh water
- Gutters return to original white
- Re-treat interval: 18–24 months
House-Wash Hypo (Why It Doesn't Work)
- Hypochlorite kills organisms — aluminum oxide isn't an organism
- Streaks remain after the bulk grime is washed off
- Some hypo will faintly lighten the streak but won't restore
- Pressure-only rinse can't strip oxide bonded to paint
- Cheap operators leave the streak behind
- Homeowners blame the gutters — really blame the chemistry
Often Bundled With
Brightening pairs with two other services — book together for the best result.
House Soft-Wash
The trained exterior discipline that soft-washes your home can brighten the gutters on the same visit — saves a trip charge and gets every exterior surface aligned. Most-booked exterior bundle.
Gutter Cleaning (Interior)
Brightening cleans the face of the gutter. Gutter cleaning clears the inside — leaves, oak debris, magnolia drop. Different jobs. Both should run on a similar cadence.
Window Cleaning
Pure-water windows + bright-white gutters = the look most clients hire us for. Knock out three exterior services in one visit.
Pricing
Bundle pricing keeps brightening accessible.
As an add-on to a house soft-wash, gutter brightening typically runs $125–$275 depending on linear footage. Stand-alone brightening starts at $175. Annual-plan clients pay roughly 15% less. For most homes, brightening is once every 18–24 months — built into the annual plan automatically.
Common Questions
What homeowners ask about gutter streaks.
My gutters were just power-washed — why are they still streaked?
Because pressure doesn't dissolve aluminum oxide. The chemistry to remove that oxide is acidic, not pressure-driven. Most house-wash operators don't carry the right chemistry, so they leave the streak. We do.
Is the chemistry safe for my landscaping?
Oxalic acid at our application concentration is gentler than vinegar and used in concentrated form in many household cleaners. We pre-rinse beds beneath gutters and post-rinse on the close. Plant safety is the same protocol as on a house wash.
Will the streaks come back?
Yes — slowly. Atmospheric carbon and acid rain don't stop. Most homes need re-brightening every 18–24 months in NE Florida humidity. The annual exterior plan keeps the cadence right without the homeowner having to track it.
Can you damage the gutters with this?
If applied at the wrong concentration or left to dwell too long, yes — overdwell on a brightener can dull the paint. We've trained our crew to time and rinse to spec. We've never damaged a gutter in this protocol.
Ready When You Are
Stop staring at the streaks.
The Gold Standard, Every Time.
