If you’re considering exterior cleaning, you’ve probably come across two common terms:
- Soft washing
- Pressure washing (water blasting)
They’re not the same — and choosing the wrong method can cause expensive damage.
In this guide, we explain the difference, when each method is appropriate, and why most residential homes in New Zealand benefit from soft washing.
What Is Pressure Washing?
Pressure washing (often called water blasting) uses high-pressure water to remove dirt, grime, and debris from hard surfaces.
It’s effective for:
- Concrete driveways
- Commercial yards
- Heavy-duty hard surfaces
- Industrial areas
However, pressure washing can be too aggressive for many residential surfaces.
What Is Soft Washing?
Soft washing uses:
- Specialised cleaning solutions
- Controlled low-pressure water
- Targeted application methods
Instead of relying on force, soft washing kills mould and algae at the root — delivering longer-lasting results without damaging surfaces.
Why Pressure Washing Can Damage Homes
Using high pressure on house exteriors can:
- Force water behind cladding
- Strip paint
- Damage plaster and render
- Cause timber splintering
- Lead to hidden moisture problems
This is especially risky for weatherboard, plaster, and modern cladding systems.
Why Soft Washing Is Safer for Residential Homes
Soft washing:
- Kills mould and algae at the source
- Protects painted surfaces
- Reduces rapid regrowth
- Extends paint lifespan
- Minimises structural risk
For most houses, soft washing is the professional standard.
👉 Learn more about professional house washing here:
https://www.metrowaterblasting.co.nz/house-wash-auckland/
When Is Pressure Washing Appropriate?
Pressure washing is best suited for:
- Driveways and concrete paths
- Heavy-duty commercial areas
- Brick retaining walls
- Hard surface restoration
👉 View professional water blasting services here:
https://www.metrowaterblasting.co.nz/water-blasting-auckland/
Roof Cleaning: Soft Treatment vs High Pressure
Roofs should almost never be cleaned using aggressive pressure.
Professional roof cleaning typically involves:
- Moss treatment
- Low-pressure rinsing
- Controlled application methods
👉 Learn about roof cleaning services here:
https://www.metrowaterblasting.co.nz/roof-cleaning-auckland/
For long-term protection, roof moss treatment is often applied.
👉 https://www.metrowaterblasting.co.nz/roof-moss-treatment/
The Cost of Choosing the Wrong Method
Improper pressure washing can lead to:
- Premature repainting
- Deck resurfacing
- Roof repairs
- Timber replacement
- Internal water damage
The cheapest method upfront often becomes the most expensive long term.
Which Method Should You Choose?
Choose Soft Washing If:
- You’re cleaning a house exterior
- You want longer-lasting results
- You want to protect paint and cladding
- You have mould or algae growth
Choose Pressure Washing If:
- You’re cleaning concrete or hard surfaces
- You need heavy-duty surface restoration
Why Professional Assessment Matters
Every property is different. A professional inspection determines:
- Surface type
- Level of contamination
- Appropriate cleaning method
- Safety considerations
Using the correct system protects your property and delivers better results.
Final Thoughts: The Smart Choice in 2026
In 2026, soft washing is the preferred method for residential exterior cleaning across New Zealand.
Pressure washing still has its place — but for most homes, soft washing delivers safer, longer-lasting results.
If you’re unsure which method is right for your property, requesting a professional quote is the safest first step.