Sandstone retaining walls
Moss and grime lifted from structural stonework.
Local Pressure Cleaning • Mosman & Lower North ShoreBOOK ONLINE & SAVE $50 OFF YOUR JOBClaim Now0497 137 966
Sandstone Cleaning • SYDNEY
Professional Sandstone Cleaning in Mosman & the Lower North Shore
Careful, measured sandstone cleaning that lifts moss, grime and efflorescence from natural stone — preserving the texture and integrity Sydney sandstone is known for.
About the service
What sandstone cleaning involves
Sandstone is a signature material across Mosman and the Lower North Shore — used in retaining walls, steps, feature walls and pool surrounds. It's also porous and relatively soft, which means the wrong pressure or the wrong chemical can etch the surface, drive staining deeper, or flush out the natural mineral colour. Specialist sandstone cleaning is about measured pressure, the right dwell time, and products that lift organic growth without harming the stone.
Black mould, green algae and efflorescence (the white mineral deposit that wicks to the surface) are the most common issues we treat. We use a low-to-moderate pressure with a broad fan, paired with a gentle biocide where needed, then allow the stone to dry before any optional sealing. The aim is a clean, natural-looking finish — not a bleached or striped one. Because sandstone varies from block to block, Tommy assesses each area and talks you through the expected result before any work begins.
What we clean
Surfaces and areas we handle
Sandstone steps
Slippery green growth cleared from treads and risers.
Feature walls
Delicate cleaning that preserves the stone's natural tone.
Pool surrounds
Salt and organic staining removed from poolside stone.
Sandstone pavers
Joint moss cleared and surface grime lifted.
Balustrade stonework
Detailed cleaning of shaped and carved stone elements.
Why Wave Wash
Why choose Wave Wash
Stone-specific pressure
Measured, low-to-moderate pressure that won't etch or gouge soft sandstone.
Gentle biocide treatment
We lift organic growth with products chosen for natural stone, not harsh bleach.
Efflorescence experience
We understand mineral staining and how to treat it without driving it deeper.
Honest expectations
Tommy walks you through what each area will look like before we start.
Real Sydney results
Before & after
Drag to compare heavy moss and grime buildup with our high-pressure restoration.
Service areas
Sandstone Cleaning across the Lower North Shore
Sandstone Cleaning is available across Mosman, Cremorne, Neutral Bay, North Sydney, Cammeray, Northbridge, Balgowlah, Seaforth and Clontarf. See our local pages for each suburb:
Frequently asked questions
Sandstone Cleaning questions answered
Will high pressure damage my sandstone?+
It can, which is exactly why we don't use high pressure on sandstone. We use a measured, low-to-moderate pressure with a wide fan and gentle biocide. The stone dictates the method, not the other way around.
Can you remove the black mould and green algae from my sandstone?+
Yes — organic growth is the most common issue we treat on sandstone, and it responds well to a gentle biocide followed by low-pressure rinsing. Most staining lifts noticeably; very deep discolouration may lighten rather than fully clear.
What about the white powdery build-up on my sandstone?+
That's efflorescence — mineral salts wicking to the surface as moisture moves through the stone. We can treat it, but it often points to an underlying moisture issue. We'll explain what we see and what to expect.
Should I seal my sandstone after cleaning?+
Sealing can help repel water and slow future organic growth, especially on horizontal surfaces. We offer penetrating sealer as an add-on and can advise whether it suits your particular stone.
How do I get a quote for sandstone cleaning?+
Text a photo of the area to 0497 137 966 or use the instant estimator for a guide. Tommy will confirm a fixed price after reviewing the stone type and extent of staining.
Need professional sandstone cleaning?
Contact Wave Wash Pressure Cleaning today to discuss your cleaning requirements and request a free quote.
Transparent pricing
Instant quote estimator
A budget guide for your Sydney property in under 30 seconds. No hidden fees or surprises.
$50 OFF when you book online
1. Surface type
2. Area (m²)60 m²
15 m²300 m²
3. Optional treatments
Estimated total
$220incl. GST · approx.
$270−$50 online booking discount
Includes $$50 off when you book online. Minimum call-out $150. Final price confirmed after photo or site review.
SurfaceDriveway Cleaning
Area60 m²
Base cleaning$270
Online booking discount−$50