What Is Soft Washing?
Soft washing is a cleaning method that uses low-pressure water (typically under 500 PSI) combined with specialized biodegradable cleaning solutions to safely remove dirt, algae, moss, mildew, and bacteria from exterior surfaces. Unlike traditional pressure washing, which relies on high-pressure water to blast away grime, soft washing uses chemistry rather than force to achieve a thorough clean.
At Shine City Pressure Washing, soft washing is our go-to method for most residential exterior cleaning in Vancouver, Surrey, and the Lower Mainland. It delivers superior results while protecting your home’s surfaces from damage.
Soft Washing vs Pressure Washing: What’s the Difference?
Understanding the difference between soft washing and pressure washing is important for protecting your property:
Pressure Washing
- Pressure: 2,000–4,000+ PSI
- Method: High-pressure water stream blasts away dirt and debris
- Best for: Hard surfaces — concrete, brick, stone, asphalt
- Risk: Can damage soft surfaces, force water behind siding, strip paint, gouge wood
Soft Washing
- Pressure: Under 500 PSI (similar to a garden hose)
- Method: Cleaning solution does the work; low pressure just rinses it away
- Best for: Siding (vinyl, Hardie board, stucco, wood), roofs, decks, fences, painted surfaces
- Risk: Minimal — the low pressure cannot damage surfaces when applied correctly
Think of it this way: pressure washing is like scrubbing a stain with steel wool, while soft washing is like soaking it in cleaner and wiping it away. Both get the job done, but one is much gentler on the surface.
When Should You Use Soft Washing?
Soft washing is the recommended method for any surface that could be damaged by high pressure. In Vancouver, this includes most residential applications:
Vinyl and Hardie Board Siding
High-pressure washing can force water behind siding panels, causing moisture damage, mold growth inside walls, and even electrical hazards. Soft washing your house safely removes years of dirt, algae, and mildew without any risk of water intrusion.
Roof Cleaning
Roof cleaning should always use soft wash methods. High pressure strips the protective granules from asphalt shingles, dramatically shortening their lifespan. Soft washing kills moss and algae at the root level, and the treatment continues working for weeks after application.
Cedar and Wood Surfaces
Cedar siding, cedar decks, and wood fences are soft and porous. Pressure washing tears the wood fibres, creating a rough, damaged surface. Soft washing cleans gently while preserving the wood grain and natural beauty.
Stucco Exteriors
Stucco cleaning requires soft wash techniques because high pressure can chip, crack, or dislodge stucco finish. Soft washing removes organic growth without compromising the stucco surface.
Painted Surfaces
Pressure washing can strip paint, especially on older homes where paint may already be peeling. Soft washing cleans painted surfaces without removing or damaging the paint.
How Does Soft Washing Work?
The soft washing process at Shine City follows these steps:
- Assessment — We inspect the surface to identify the type of growth (moss, algae, mildew) and choose the appropriate cleaning solution.
- Pre-treatment — We apply a biodegradable cleaning solution to the surface. The solution breaks down organic matter and kills mold, mildew, and algae at a cellular level.
- Dwell time — The solution is left to work for 10–20 minutes, depending on the severity of buildup. This is where the cleaning actually happens.
- Rinse — We gently rinse the surface with low-pressure water, washing away the dissolved grime and cleaning solution. The surface is left clean and undamaged.
- Post-treatment — For roofs and heavily affected areas, we may apply a preventive treatment that inhibits regrowth for 1–2 years.
Is Soft Washing Safe for Plants and Pets?
The cleaning solutions we use at Shine City are biodegradable and eco-friendly. They break down into harmless components (water, oxygen, and salt) within minutes of being rinsed. We take additional precautions:
- Pre-wetting plants and gardens before and after treatment
- Using plant-safe concentrations near landscaping
- Rinsing all surrounding areas thoroughly
- Keeping pets indoors during the cleaning process
After the rinse is complete and surfaces have dried (typically 30–60 minutes), the area is completely safe for children, pets, and plants.
How Much Does Soft Washing Cost in Vancouver?
Soft washing pricing is similar to or slightly higher than traditional pressure washing because of the specialized cleaning solutions used:
- House washing (soft wash): $250–$800 depending on size — see our full pricing guide
- Roof cleaning (soft wash): $300–$600 — see our roof cleaning cost guide
- Deck cleaning (soft wash): $150–$400
- Fence cleaning (soft wash): $100–$350
The slightly higher cost is offset by better results and longer-lasting cleanliness — soft wash treatments inhibit regrowth, so you won’t need to clean as frequently.
Why Soft Washing Is Especially Important in Vancouver
Vancouver’s wet, mild climate creates perfect growing conditions for moss, algae, and mildew. These organisms thrive in our 1,100+ mm of annual rainfall and mild year-round temperatures. Unlike drier climates where surfaces mainly collect dust and dirt, Vancouver homes battle biological growth — and soft washing is specifically designed to kill and prevent biological growth.
Pressure washing alone only removes the surface layer of moss and algae. Soft washing kills the roots and spores, providing much longer-lasting results. That’s why professional exterior cleaning companies in the Lower Mainland increasingly use soft wash as their primary method.
Frequently Asked Questions About Soft Washing
How long do soft washing results last?
Soft washing results typically last 1–3 years depending on the surface and environmental conditions. Roofs in shaded areas may need re-treatment sooner, while south-facing walls with good sun exposure can stay clean for 2–3 years. The preventive treatment we apply inhibits regrowth significantly longer than pressure washing alone.
Can I soft wash my house myself?
While DIY soft washing is possible with the right equipment and solutions, we recommend professional service for several reasons: the cleaning solutions require proper dilution and handling, working at heights is dangerous, and incorrect application can leave streaks or damage plants. Professional soft washing is affordable and ensures a thorough, safe result.
Does soft washing work in the rain?
Yes! Light rain doesn’t affect soft washing effectiveness since we’re already applying water. The cleaning solution adheres to surfaces even in wet conditions. However, heavy downpours can dilute the solution before it has adequate dwell time, so we may reschedule in severe weather.
Is soft washing the same as power washing?
No. Power washing and pressure washing both use high-pressure water (2,000+ PSI), while soft washing uses low pressure (under 500 PSI) with cleaning solutions. The terms “power washing” and “pressure washing” are often used interchangeably, but soft washing is a distinctly different and gentler technique.
What surfaces should NOT be soft washed?
Almost all surfaces benefit from soft washing. The only exception might be bare, unsealed concrete or very dirty brick where high-pressure washing is actually more effective. For flat concrete surfaces like driveways and patios, we typically use pressure washing — see our pressure washing pricing.
Protect your home with the right cleaning method. Get your free soft washing estimate from Shine City Pressure Washing — Vancouver’s trusted exterior cleaning professionals with 290+ five-star Google reviews.
