Soft washing is a low-pressure method used to clean house exteriors without relying on strong water force. It combines gentle rinsing with a cleaning treatment that helps loosen mould, algae, dirt and other exterior buildup.
For many New Zealand homes, soft washing is more suitable than high-pressure cleaning, especially on painted weatherboards, plaster cladding and other delicate surfaces.
The correct method still depends on the material, paint condition and level of buildup.
This guide explains how soft washing works, how it differs from pressure washing, which surfaces may be suitable, and the common mistakes homeowners should avoid.
What Is Soft Washing?
Soft washing uses low water pressure together with a cleaning treatment suited to the exterior surface. The treatment helps break down mould, algae, lichen and grime before the area is gently rinsed.
Unlike pressure washing, soft washing does not rely mainly on water force. This makes it a better option for surfaces that may be marked, stripped or damaged by high pressure.
It is often used on painted weatherboards, plaster cladding and other delicate house exteriors. However, the surface should still be inspected first, as damaged paint, cracks, weak seals or exposed timber may need attention before cleaning begins.
The aim is not to use the strongest method. It is to remove the buildup using the lowest suitable pressure for the surface.
Soft Washing vs Pressure Washing
Soft washing and pressure washing both clean exterior surfaces, but they work in different ways.
Soft Washing
Soft washing uses low water pressure with a suitable cleaning treatment. The treatment loosens mould, algae, lichen and grime before the surface is gently rinsed.
It is often more suitable for:
- Painted weatherboards
- Plaster and monolithic cladding
- Delicate exterior coatings
- Some timber surfaces
- House exteriors with vulnerable joints or seals
Because it relies less on water force, soft washing helps reduce the risk of paint damage, surface marks and water entering behind cladding.
Pressure Washing
Pressure washing uses stronger water pressure to remove dirt and buildup from hard exterior surfaces.
It is generally more suitable for:
- Concrete driveways
- Paths
- Paving
- Some brick and masonry
- Other durable outdoor areas
High pressure should not be used across the entire house simply because the surface looks dirty. A setting that works well on concrete may damage paint, timber, mortar or delicate cladding.
Which Method Is Better?
Neither method is better for every surface.
Soft washing is usually the safer choice for painted and delicate house exteriors, while controlled pressure washing may be suitable for stronger surfaces such as concrete and paving.
Some properties need both methods. The house may require soft washing, while the driveway and paths can be cleaned using controlled pressure.
8 Common Soft-Washing Mistakes to Avoid
Soft washing is gentler than pressure washing, but the wrong process can still damage paint, cladding, plants or surrounding areas. These are the most common mistakes homeowners should avoid.
1. Not Inspecting the Exterior First
Before cleaning, check the surface for peeling paint, cracks, exposed timber, damaged seals and previous repairs.
Soft washing will remove dirt and organic growth, but it will not fix an existing surface problem. Damaged areas may need repair before water or cleaning treatments are applied.
2. Assuming Every Surface Can Be Soft Washed
Low pressure does not automatically make a cleaning method suitable for every material.
Some coatings, older finishes, untreated timber and damaged surfaces may react poorly to moisture or cleaning products.
Check the material and manufacturer’s guidance before starting.
3. Using an Unsuitable Cleaning Product
A product that works on one surface may stain, fade or damage another.
Avoid using strong household cleaners or mixing products without clear instructions. The cleaning treatment should suit the surface and the type of buildup being removed.
4. Skipping a Test Area
Always test the cleaning method on a small, less visible section first.
Check for changes in colour, texture, paint condition and surface finish before applying the treatment to the full exterior.
5. Directing Water Into Joints and Openings
Even at low pressure, water should not be aimed into window seals, door frames, vents, cladding joints or electrical fittings.
Water can enter through small gaps and reach areas that are difficult to dry. Keep the rinse controlled and directed along the surface.
6. Failing to Protect Plants and Nearby Areas
Cleaning treatments and dirty runoff can affect plants, outdoor furniture, vehicles and neighbouring surfaces.
Move loose items, protect sensitive plants and identify nearby drains before cleaning begins. Follow the product label when managing runoff and rinsing surrounding areas.
7. Attempting Roofs or Upper Storeys Without Safe Access
Soft washing still involves wet surfaces, hoses and areas that may be difficult to reach.
Roof cleaning and upper-storey work should not be attempted without suitable access equipment and training. These jobs are usually safer to leave to a professional.
8. Washing on a Fixed Schedule
A house does not always need cleaning simply because a set number of months has passed.
Inspect the exterior and look for mould, algae, salt residue, staining and visible grime. Some shaded or coastal properties may need attention sooner, while more sheltered homes may stay clean for longer.
The safest approach is to match the cleaning method and timing to the condition of the property.
Which House Exteriors Can Be Soft Washed?
Soft washing can be suitable for many residential exterior surfaces, but the condition of the material should always be checked before cleaning begins.
Painted Weatherboards
Painted weatherboards often benefit from a low-pressure approach because strong water pressure may lift loose paint, leave visible marks or force water into joints.
Before soft washing, check for peeling paint, exposed timber and damaged sealant. These areas may need repair before cleaning.
Plaster and Monolithic Cladding
Plaster and monolithic cladding can collect mould, algae and dirt, especially in shaded or damp areas.
Soft washing may be suitable because it uses less water force than pressure washing. However, cracks, damaged coatings and possible moisture-entry points should be inspected first.
Brick and Masonry
Some brick and masonry surfaces can be soft washed when the main problem is mould, algae or surface grime.
The condition of the mortar still matters. Cracked or crumbling joints may need repair before any cleaning method is used.
Timber Surfaces
Some painted, stained or sealed timber surfaces may be cleaned using a controlled low-pressure method.
Untreated, damaged or weathered timber needs extra care because moisture and cleaning products may affect the grain, colour or finish. A small test area should be completed first.
Delicate Exterior Coatings
Soft washing may be appropriate for exterior finishes that could be marked or stripped by high pressure.
The coating manufacturer’s maintenance instructions should be followed whenever they are available. If the finish is faded, cracked or already failing, cleaning will not repair the underlying problem.
Areas Around Windows and Doors
Lower pressure reduces the risk of forcing water into window seals, door frames and exterior joints, but these areas still need careful cleaning.
Avoid directing water into openings, vents or damaged seals. The cleaning method should protect both the surface and the areas around it.
Soft washing is not automatically safe for every exterior. The material, coating condition, previous repairs and manufacturer’s guidance should all be considered before work begins.
How Often Should You Soft Wash a House?
For many New Zealand homes, soft washing about once a year is a practical starting point. However, the right schedule depends on the property and how quickly mould, algae, salt and dirt return.
Homes may need cleaning sooner when they are:
- Close to the coast
- Surrounded by trees
- Heavily shaded
- Exposed to frequent rain or moisture
- Near busy roads or construction
- Affected by recurring mould or algae
More sheltered homes may stay clean for longer and may not need a full wash every year.
Check the exterior every six months rather than relying only on a fixed schedule. Look for green or black growth, salt residue, dirt below gutters, discolouration and slippery areas around paths or entrances.
Soft washing too often is unnecessary and may place avoidable stress on older paint, seals and exterior finishes. The condition of the house should determine when it needs cleaning.
How Long Does It Take to Soft Wash a House?
The time needed to soft wash a house depends on the size of the property, the number of storeys, access around the exterior and the amount of buildup.
A straightforward single-storey home with clear access will usually take less time than a large or multi-storey property with heavy mould, algae or difficult-to-reach areas.
The process may include:
- Inspecting the cladding and exterior condition
- Protecting plants, furniture and nearby surfaces
- Applying the cleaning treatment
- Allowing enough time for the treatment to work
- Rinsing the exterior carefully
- Checking the finished result
Additional areas such as decks, fences, gutters, paths or driveways will increase the total time.
A professional should provide an estimate based on the actual property rather than promising one fixed duration for every house.
Can You Soft Wash a Two-Storey House?
Yes, a two-storey house can be soft washed, but access and safety need careful planning.
Upper walls, eaves and areas around windows can be difficult to reach from the ground. Using ladders while handling hoses or cleaning equipment increases the risk of falls, especially when surfaces are wet.
A professional may use extension equipment or another safe access method to clean upper areas without applying unnecessary pressure to the cladding.
Before work begins, the exterior should be checked for:
- Cracks or damaged coatings
- Loose paint
- Weak window seals
- Open joints or vents
- Electrical fittings
- Difficult access around the property
The cleaning method should be adjusted for each part of the house. A two-storey home may have different cladding, levels of buildup and exposure on the upper and lower areas.
Because of the height and access risks, professional soft washing is usually the safer choice for a two-storey house.
When Should You Hire a Professional?
Some small, ground-level areas may be manageable for homeowners, but full exterior soft washing often requires surface knowledge, safe access and controlled use of cleaning treatments.
Consider hiring a professional when:
- The property has two or more storeys
- The cladding is painted, cracked or already damaged
- You are unsure which cleaning treatment is suitable
- There is heavy mould, algae, lichen or salt buildup
- The house has difficult access around walls, eaves or windows
- The work is close to electrical fittings, vents or weak seals
- Several exterior materials need different cleaning methods
- Roofs, balconies or upper areas are included
A professional should inspect the exterior before starting. This helps identify damaged paint, open joints, weak seals and surfaces that may need a different method.
Before approving a quote, ask:
- Which areas are included
- What cleaning method will be used
- How plants and nearby surfaces will be protected
- Whether windows, gutters, decks or paths cost extra
- Whether the company is insured
- How long the work is expected to take
The company should be able to explain why soft washing is suitable for your property rather than using the same process on every house.
Frequently Asked Questions
Is soft washing safe for house paint?
Soft washing is often safer for painted exteriors than high-pressure cleaning because it uses less water force.
However, the paint should still be inspected first. Peeling, bubbling, faded or damaged coatings may react poorly to moisture or cleaning treatments and may need repair before washing.
What is used to soft wash a house?
Soft washing usually combines low-pressure water with a cleaning treatment chosen for the surface and type of buildup.
The exact product should suit the cladding, paint condition and problem being treated. Avoid using strong household cleaners or mixing products without clear manufacturer instructions.
Can soft washing remove mould and algae?
Soft washing can help remove mould, algae, lichen and general exterior grime.
The result depends on the surface, level of buildup and treatment used. Heavy or established growth may need more than one stage or additional maintenance.
Can brick be soft washed?
Some brick surfaces can be soft washed, especially when the main problem is mould, algae or surface dirt.
The mortar should be checked first. Cracked, loose or crumbling joints may need repair before cleaning begins.
Can you wash a house without high pressure?
Yes. Many painted and delicate house exteriors can be cleaned using low-pressure or soft-washing methods.
These methods rely more on a suitable cleaning treatment and controlled rinsing than on strong water force.
Should a house be washed before painting?
Yes. Cleaning helps remove dirt, mould, chalky residue and other buildup that may affect how well new paint adheres.
The surface should be allowed to dry fully before painting. Loose paint, cracks, exposed timber and damaged coatings should also be repaired first.
Professional Soft Washing in New Zealand
Sun SoftWash provides low-pressure house washing and exterior cleaning across Auckland, Hamilton and Tauranga.
Before cleaning begins, the team checks the cladding, paint condition, access and type of buildup. This helps determine whether soft washing, controlled pressure cleaning or another method is suitable for each area.
Different parts of the property may need different approaches. Painted weatherboards and plaster cladding may require soft washing, while concrete paths and driveways may be better suited to controlled water blasting.
Contact Sun SoftWash for a property-specific assessment and quote. The team can explain which areas are included, how nearby plants and surfaces will be protected, and which cleaning method is recommended for your home.
