Many homeowners try rinsing stained siding with a hose or pressure washer, only to find the stains barely fade — or come back quickly. That’s because most siding stains aren’t dirt.
Black and green staining is usually caused by organic growth that bonds to siding and feeds on moisture in the air. Removing it requires treatment, not force.
Green stains are most commonly algae. Algae thrives on moisture and shade and spreads easily through airborne spores.
Common contributors include:
Once algae settles, it spreads quietly until the siding looks discolored.
Black stains are often mildew or mold-related growth. These stains tend to appear in streaks where water repeatedly runs down siding.
Black staining is commonly caused by:
These stains can darken siding quickly if left untreated.
Using high pressure on siding is a common mistake. Excessive pressure can:
Siding should be cleaned using low-pressure house washing, not force.
Professional house washing uses surface-safe cleaning solutions that break down algae and mildew at the root.
Once treated, stains release naturally and are gently rinsed away. This removes discoloration without damaging siding or forcing water where it doesn’t belong.
Rinsing siding removes visible staining but leaves spores behind. Those spores reactivate with moisture and return quickly.
Professional treatment:
It’s preventative, not temporary.
Organic growth traps moisture against siding. Over time, this can lead to:
Cleaning early prevents damage.
Removes black and green streaks.
Prevents moisture-related damage.
Brightens the entire home exterior.
Slows regrowth significantly.
Professional house washing is safe and effective for:
Each material is cleaned using the appropriate method.
Most homes benefit from house washing once per year. Homes in shaded or humid areas may need bi-annual service.
Routine washing prevents heavy staining and surface wear.
DIY cleaning often uses inconsistent pressure or improper chemicals, leaving streaks or patchy results.
Professional services ensure even coverage and consistent results across the entire home.
Once siding is clean, windows, trim, landscaping, and entryways all stand out more. The home feels brighter and better maintained overall.
Many homeowners underestimate how much siding stains affect curb appeal.
Professional treatments remove organic growth at the root instead of spreading it. Correct technique prevents surface damage that attracts dirt faster.
This keeps siding cleaner between cleanings.
Black and green stains signal moisture issues. Addressing them early protects siding and prevents deeper problems.
House washing is one of the easiest ways to protect your home’s exterior.
If your siding has streaks, patches, or discoloration that won’t rinse away, professional house washing can restore it safely.
Schedule a free consultation today and keep your siding clean, protected, and looking its best year-round.
Give your home or business the care it deserves. Request a free quote now and let Dirt Defense provide spotless results with unmatched reliability.
