Why a Gurney Alone Won’t Give You a Proper House Wash

Before you head to Bunnings to buy a gurney, read this. Let’s clear this up once and for all: a gurney is not a house-washing solution.

It’s a tool. A useful one. But if you’re trying to remove years of dirt, mould and lichen from a home using only a gurney, you’re basically bringing a butter knife to a chainsaw fight.

A proper house wash isn’t about blasting everything in sight. It’s about the right balance of pressure, chemicals, and technique—and that’s where most DIY jobs (and some “quick wash” operators) go wrong.

What a Gurney Is Actually Designed For

A gurney (also called a surface cleaner) is built for flat, hard surfaces:

• Driveways

• Concrete paths

• Pavers

• Large, even areas

It works by spinning jets evenly across a surface, giving you consistent pressure and a streak-free finish on the right material.

What it’s not designed for:

• Vertical walls

• Eaves, trims, and corners

• Textured surfaces

• Delicate finishes like render, weatherboard, or painted exteriors

Trying to force a gurney to do a house wash is like trying to mop your walls. Technically possible. Practically useless.

Why Houses Need More Than Pressure

Here’s the uncomfortable truth: pressure alone doesn’t kill mould, lichen, or algae.

It might remove the surface layer, but it often:

• Leaves roots and spores behind

• Causes patchy results

• Forces you to use higher pressure (which risks damage)

That’s why homes washed with “just pressure” often look dirty again within weeks.

A proper wash works with the biology, not against it.

The Real Formula for a Proper House Wash

A professional house wash uses three things working together:

1. The Right Chemicals

Specialised cleaning solutions break down mould, lichen, and organic build-up at the root.

This means:

• Less pressure required

• Longer-lasting results

• A safer clean for paint and surfaces

No chemicals = short-term results. Full stop.

2. Controlled Pressure

More pressure does not mean better results.

In fact, too much pressure can:

• Strip paint

• Etch render

• Force water behind cladding

Professionals adjust pressure depending on the surface—not ego.

3. Technique (This Is the Big One)

Corners, edges, trims, joins, and awkward angles are where dirt hides—and where gurneys fail.

Good technique means:

• Using a lance for detail work

• Switching angles and distances

• Letting chemicals dwell properly

• Rinsing thoroughly and evenly

This is where experience shows.

What Happens When You Use a Gurney on a House

We see it all the time:

• Tiger striping

• Missed patches

• Uneven colour

• Mould that comes back fast

The house might look cleaner from a distance, but up close? The story’s different.

And if high pressure was used to compensate for lack of chemicals? That’s when damage creeps in quietly—and expensively.

So When Should a Gurney Be Used?

A gurney is brilliant when it’s used for what it was designed for:

• Driveways

• Concrete slabs

• Large flat outdoor areas

But a proper exterior clean?

That’s a soft wash + targeted pressure + skilled technique job.

The Bottom Line

If someone tells you they can “just gurney the house,” here’s what they’re really saying:

“I’m skipping the chemistry and the detail work.”

A proper house wash isn’t louder.

It isn’t faster.

And it definitely isn’t just one tool.

It’s a system and when it’s done right, the results last.