Your home’s exterior is its first line of defense against the elements. Over time, this exposure leads to more than just a little dirt accumulating on your home’s siding and other exterior surfaces. From mold and algae to pollen and pollutants, your home is a magnet for grime, residue, and organic growth. But never fear! There’s a safe, effective way to restore your home’s beauty without damaging its surfaces—soft washing.
In this blog, we’ll explore what’s really sticking to your siding, why it matters, and why soft washing is the best method to safely clean and protect all types of home siding.
What Kind of Buildup Can Soft Washing Remove?
You might be surprised by what’s stuck to your home’s exterior walls (and its roof, eaves, window frames, porches, and decks). Common contaminants that build up on siding and other exterior areas include:
- Dirt and dust – carried by wind and rain, common regardless of climate
- Pollen – sticks to surfaces during allergy season, prevalent in the South
- Mold and mildew – caused by moisture, heat and poor ventilation
- Algae – including Gloeocapsa magma, which appears as black streaks on asphalt roof shingles
Moss and lichen - organic growth that thrives in damp, shaded areas - Bird droppings – acidic and damaging to paint and siding
- Insect nests and spider webs – especially around windows and eaves
- Airborne pollutants – from traffic, factories, and fireplaces
- Rust stains and hard water residue – from irrigation systems or metal fixtures
These contaminants don’t just look unsightly, they can also damage your siding, reduce your home’s value, and even affect your health.
Soft washing your home is a great addition to your fall home maintenance checklist.
- Removes summer buildup—sprinkler overspray, grime from summer storms, pollen, organic growth
- Reduces the risk of freeze-thaw damage and stains setting in during colder weather
- May uncover siding damage that needs to be repaired before winter
- Moderate fall temps and lower humidity results in more effective cleaning
Why is Soft Washing Recommended for Cleaning Siding?
Soft washing is a gentle yet highly effective cleaning method that uses low-pressure water combined with biodegradable cleaning solutions to break down and remove organic buildup, dirt, and stains. Unlike pressure washing, which can be too harsh on some surfaces, soft washing is designed to be safe for all types of residential siding.
Soft washing works by applying a specialized cleaning solution to break down buildup at the molecular level. This effectively kills mold, mildew, algae, and bacteria at the root for a long-lasting effect. When needed, a low-pressure water spray is used to rinse the treated surface.
In addition to siding, soft washing is often used to clean roof surfaces, including shingle, tile and metal roofs. It’s also a safer alternative than pressure washing for fascia, trim, and other painted, delicate surfaces on the exterior of your home.
Soft washing delivers more than just a clean, fresh look. Benefits of soft washing your home include:
- Extends the life of your siding and roof
- Improves curb appeal and home value
- Prevents damage from high-pressure methods
- Reduces allergens and improves air quality
- Cleans without harm to people, pets or landscaping
Types of Residential Siding and Cleaning Recommendations
While soft washing is effective for all types of residential home exteriors, different siding materials require different cleaning methods. Depending on the level of grime, there are some DIY methods that can keep dirt at bay. If in doubt, a professional cleaning service will be able to apply the right amount of pressure and avoid cleaning solutions that can damage or stain surfaces.
Vinyl Siding
- Prone to green algae and mildew.
- Soft washing gently cleans without risking cracks or warping or water making its way behind planks.
- If not highly contaminated, can be cleaned effectively with water and dish soap or vinegar.
Wood Siding
- Hardest type of siding to maintain without damage.
- Susceptible to mold, rot, warping, and splintering if not cleaned properly.
- Staining, painting, or sealing helps protect against the elements.
Composite Siding
- Durable but can trap grime and pollen in grooves.
- Soft washing cleans without stripping protective coatings.
- Clean with gentle detergent, a brush, and very low pressure. Avoid harsh chemicals.
- Professional cleaning recommended to avoid damage.
Fiber Cement Siding
- Versatile, durable, weather and pest resistant
- Can stain and discolor from mold or pollution.
- Soft washing lifts stains without degrading the surface.
Aluminum Siding
- Easy to clean but can oxidize and streak if not cleaned properly
- Soft washing removes oxidation and restores color.
- Pressure washing or a scrub brush can be used for more difficult stains.
Stucco
- Textured surface holds onto dirt, mold and algae.
- Durable but prone to hairline cracks that can get worse over time.
- Soft washing is recommended to avoid damage and cracking.
Stone Veneer
- Moss and lichen grow easily in the crevices.
- If maintained often, can be cleaned using a garden hose.
- Soft washing cleans surface and inside gaps without damaging mortar.
- Susceptible to damage from bleach and acid-based cleaners.
Natural Stone
- Can discolor and grow algae.
- Needs delicate handling to avoid etching or chemical reactions.
- Soft washing lifts grime while preserving texture and color.
- Gentle detergent and a garden hose may be effective on less soiled areas.
Brick
- Can develop moss and white efflorescence.
- Pressure washing can loosen bricks and create space for moisture to accumulate.
- Like stone, may be cleaned with gentle detergent and a hose.
- Professional soft washing recommended for the best clean, especially for painted brick.
Signs It’s Time to Soft Wash Your Home’s Siding
Wondering if your home is due for a soft wash? Look for these signs:
- Green or black streaks
- White, chalky residue
- Sticky dirt buildup
- Insect webs and nests
- Algae, moss or lichen buildup
- Clogged gutters overflowing onto siding
- Increased allergy symptoms indoors
- Musty or mildew-like smell near siding
For most homes, soft washing every 1 to 2 years is ideal. However, frequency may vary depending on:
- Local climate and humidity
- Tree and plant coverage
- Exposure to pollution or road dust
- HOA or neighborhood maintenance standards
- Curb appeal boost for home sellers
Frequently Asked Questions
What’s the difference between soft washing and pressure washing?
Soft washing uses a low-pressure water stream and cleaning agents. Pressure washing uses a high-pressure stream and is better for hard surfaces like concrete.
Will soft washing remove mold and algae?
Absolutely. Soft washing is designed to kill organic growth at the source and the effects typically last for months.
How often should my home’s siding be soft washed?
Every 1–2 years, depending on your climate and surroundings. Homes in humid or coastal areas may need more frequent cleanings to prevent algae growth.
Can I soft wash my home myself?
It’s possible, but risky. Incorrect technique or chemicals can damage siding or landscaping. It may also be difficult to effectively clean multi-story homes.
Your Siding is Dirtier Than You Think—Soft Washing to the Rescue!
Your home’s siding takes a beating from many different culprits. Soft washing is the home cleaning hero you didn’t know you needed! Regular soft washing removes harmful contaminants, enhances curb appeal, extends the life of your siding, and helps make your home a healthier place for you and your family.
Ready to restore your home’s shine? Window Hero's professional house washing service delivers a safe, highly effective deep clean for any type of home siding. Request a free quote today!