If you live in Surrey or White Rock, you’ve probably noticed green, black, or even reddish stains forming on the siding of your home. These marks are not just dirt — they’re usually signs of organic growth, like algae, mold, mildew, or moss, thriving in our damp, coastal climate.
Understanding what’s growing on your siding — and how to treat it — is essential for protecting both the appearance and integrity of your home.
Why Organic Growth Is So Common in Surrey and White Rock
Homes in this region are regularly exposed to high humidity, frequent rainfall, and moderate temperatures, especially during fall, winter, and early spring. These conditions are ideal for biological growth on outdoor surfaces — particularly in areas that receive little sunlight or have poor drainage.
North-facing walls, shaded areas behind trees, and siding close to vegetation or the ground are especially vulnerable.
Over time, these organisms can:
Discolor your siding
Trap moisture against the surface
Cause long-term staining or deterioration
Increase the risk of wood rot or surface breakdown
That’s why regular exterior cleaning is not only cosmetic, but also preventative.
The Most Common Types of Growth Found on Siding
1. Green Algae
This is the most common type of staining seen on siding in coastal BC. It thrives in shaded, damp areas and spreads quickly. Algae won’t eat away at your siding, but it holds moisture and dirt, which can attract more damaging organisms.
2. Black Mold or Mildew
Black streaks or spots can often be mold or mildew, particularly on vinyl or painted wood surfaces. These are more harmful than algae, as they may penetrate porous materials, causing stains that are difficult to remove and potentially leading to health concerns.
3. Moss
Though moss is more common on roofs, it can appear on siding near the ground or in moist areas. Moss traps water and can push underneath siding or grow into crevices, which may lead to material breakdown over time.
Why Pressure Washing Alone Isn’t Enough
Many homeowners assume that pressure washing will solve the problem. However, using high pressure on siding — especially vinyl, wood, or painted surfaces — can cause damage and only remove the surface layer of organic growth.
The correct solution is soft washing — a low-pressure method that uses a biodegradable cleaning solution to kill algae, mold, and mildew at the root. This ensures deeper, longer-lasting results without harming your siding.
At Axion Pressure Washing, our soft washing process is tailored for the unique needs of homes in Surrey and White Rock. We apply a targeted treatment that breaks down organic buildup, followed by a gentle rinse to remove stains safely.
Benefits of Proper Siding Maintenance
Preserves curb appeal
Prevents long-term staining and material degradation
Improves home hygiene and air quality
Extends the lifespan of your exterior finishes
Regular soft washing not only keeps your home looking clean and fresh, but also protects your investment by avoiding the high costs of repainting, repairs, or early replacement of siding materials.
Book Your Siding Cleaning in Surrey or White Rock
If you’re seeing discoloration, streaks, or signs of organic growth on your siding, now is the time to act. At Axion Pressure Washing, we provide safe, effective soft wash services that eliminate algae, mold, and moss — and keep them from coming back.
Contact us today for a free estimate and let’s restore your home’s exterior the right way.
