Will House Washing Kill My Grass?

House washing is one of the most effective ways to remove mould, algae, dirt and grime from the exterior of a home. But if your lawn grows right up to the walls of your house, there is another question you might have before booking the job: will house washing kill or damage my grass?

The short answer is that professional house washing should not kill your lawn when the cleaning process is carried out correctly. However, some of the cleaning solutions used to treat mould and organic growth can potentially discolour or damage grass if they reach it at excessive concentrations or are allowed to accumulate in one area.

This is why protecting the lawn around a home is an important part of professional house washing. The cleaning method, concentration of the solution, amount of fresh water used and management of runoff can all make a difference.

Why Could House Washing Affect Grass?

Professional house washing often involves more than water alone. Exterior walls can develop mould, mildew, algae and other organic growth that isn’t always effectively treated by simply blasting the surface with high pressure.

Instead, an appropriate cleaning solution may be applied to help treat the contamination before the exterior is rinsed. This allows surfaces such as painted walls, render and cladding to be cleaned using considerably less pressure than might otherwise be required.

You can read more about this approach in our article Soft Washing vs Pressure Cleaning: What’s the Difference?

The reason this matters to your lawn is simple: a product designed to treat organic growth on your house shouldn’t be unnecessarily applied to living grass. If cleaning solution reaches the lawn at an inappropriate concentration, there is a possibility of temporarily discolouring or damaging it. The solution isn’t to avoid professional house washing. It is to make sure the lawn is considered as part of the cleaning process.

Can House Washing Chemicals Kill Your Lawn?

In high concentrations, some exterior cleaning products have the potential to damage grass. That doesn’t mean a small amount of diluted overspray automatically results in a dead lawn. The concentration, quantity and length of exposure all matter.

There is also a considerable difference between incidental runoff reaching a large area of lawn and concentrated cleaning solution repeatedly flowing into the same narrow strip of grass beside a house.

This is one reason professional exterior cleaning requires more judgement than simply choosing a product and spraying it onto every surface. The cleaning solution needs to be suitable for the job and applied at an appropriate concentration, while consideration is given to everything surrounding the area being cleaned.

Why Water Is Important When House Washing Near Grass

Fresh water is one of the simplest tools available for protecting a lawn during house washing. Depending on the cleaning method and products being used, grass around the perimeter of the home may be wet before cleaning begins. If incidental cleaning solution subsequently reaches the lawn, it is reaching grass that has already been saturated with fresh water rather than a completely dry surface.

Additional rinsing can also help dilute residue and prevent cleaning solution from remaining concentrated in the grass or soil immediately beside the house. This doesn’t mean that simply flooding the lawn makes careless chemical application acceptable. The cleaning product still needs to be properly controlled. Water is part of the overall process rather than a substitute for appropriate application.

What About Grass Growing Directly Against the House?

This is where the question becomes particularly relevant. Many Sunshine Coast homes have lawn running right up to the edge of the building. When the wall above is being washed, some rinse water will naturally end up on the grass below.

That isn’t necessarily a problem. What matters is what is in that runoff, how concentrated it is and whether it is allowed to repeatedly collect in the same area. Before cleaning begins, the operator should consider where water from the exterior walls will travel. Particular attention may be required around low points where runoff naturally collects or narrow strips of lawn that receive water from a large section of wall.

The aim isn’t to promise that no water will touch your grass. When the lawn sits directly underneath the surface being washed, that would be unrealistic. The objective is to manage the cleaning process so the grass isn’t unnecessarily exposed to concentrated cleaning solution.

Will House Washing Turn Grass Brown?

If grass is exposed to a very high concentration of cleaning solution, browning or discolouration can occur. That is one of the reasons homeowners sometimes become concerned when they hear that cleaning products may be used during a house wash. However, there is an important distinction between what a cleaning chemical can do when misused and what should happen during a properly managed professional clean.

The operator can control how the cleaning solution is mixed and applied, minimise unnecessary overspray, use fresh water around vulnerable areas and rinse the lawn where appropriate. Your grass should therefore be treated as part of the property that needs protecting, not simply somewhere for the runoff to go.

Does Soft Washing Make Grass More Vulnerable?

Soft washing can actually allow exterior surfaces to be cleaned without relying on excessive water pressure. However, because cleaning solutions play an important role in the process, their use around lawns still needs to be carefully managed.

The term “soft” refers primarily to the lower-pressure cleaning method. It doesn’t mean that every cleaning solution involved is automatically harmless to grass.

This is why choosing the right cleaning method and protecting the surrounding property go hand in hand. Coast Pressure Clean’s house washing on the Sunshine Coast uses cleaning methods appropriate for residential exterior surfaces rather than treating a house in the same way as a concrete driveway.

Professional house washing is about balancing effective cleaning with the protection of the surfaces and areas surrounding the home.

Should You Water Your Lawn Before House Washing?

You don’t necessarily need to turn the sprinkler on for hours before your pressure cleaner arrives. The appropriate preparation depends on the products being used, the layout of the property and how close the lawn is to the surfaces being cleaned. Pre-wetting and rinsing grass may form part of the cleaning process where required.

If you are particularly concerned about your lawn, ask the cleaner what precautions they take before the job begins. It is also worth pointing out areas that may not be immediately obvious. Newly laid turf, recently seeded lawn or grass that is already struggling due to heat or dry conditions may warrant additional attention.

What About Newly Laid Turf?

New turf deserves particular consideration because it is still becoming established.

If you’ve recently laid turf immediately beside the house, let your pressure cleaning team know when arranging the job. Depending on how recently it was installed and where it sits in relation to the walls being cleaned, additional precautions may be appropriate.

The same applies if you have recently repaired bare patches or reseeded an area beside the house. There is little benefit in having beautifully clean exterior walls if the cleaning process unnecessarily compromises a lawn you’ve just spent time and money establishing. Flagging new turf beforehand allows it to be considered when the job is planned.

Where Does the Water Go After the House Is Washed?

When an exterior wall is rinsed, the water carries away the dirt, mould and contaminants that have been removed from the house, along with traces of whatever cleaning solution has been used. Some of that water may naturally reach the lawn.

Runoff therefore needs to be considered throughout the job. A particular concern is allowing water to repeatedly collect in the same low point rather than dispersing across a larger area.

It’s a similar principle to the issue we discussed in Can You Pressure Clean Around a Swimming Pool Without Affecting the Pool Water? Cleaning the surface is only one part of the job. Where the water and cleaning solution go afterwards also matters.

Can You Prevent Every Drop of Cleaning Solution From Reaching the Grass?

Probably not, and a promise that absolutely nothing will ever reach a lawn directly beneath an exterior wall wouldn’t be particularly realistic. Professional cleaning is instead about controlling and diluting exposure.

Careful application can reduce overspray. Fresh water can be used where appropriate. Runoff can be considered before cleaning begins. Cleaning solutions can be used at appropriate concentrations rather than assuming stronger is always better.

These precautions allow the house to be properly cleaned while reducing the risk to the lawn surrounding it.

Why Professional House Washing Makes a Difference

House washing requires an understanding of more than the surface being cleaned. The operator needs to consider what the exterior is made from, what is growing on it, which cleaning method is appropriate, what concentration of cleaning solution is required and what surrounds the house.

That’s particularly important on the Sunshine Coast, where lawns commonly sit directly beneath exterior walls that experience significant mould and algae growth in the humid conditions. Professional house washing on the Sunshine Coast should therefore achieve two things: properly clean the exterior and take sensible precautions to protect the surrounding property.

So, Will House Washing Kill or Damage Your Grass?

When professional house washing is carried out correctly, it should not kill your grass.

Cleaning solutions can potentially cause lawn discolouration or damage when they are used incorrectly or reach grass at excessive concentrations. That’s why controlled application, appropriate dilution, fresh-water rinsing and runoff management are important when washing a house surrounded by lawn.

If you have newly laid turf or an area of lawn you’re particularly concerned about, mention it before cleaning begins so it can be taken into consideration.

Coast Pressure Clean provides professional house washing throughout the Sunshine Coast, using cleaning methods appropriate for the exterior surface and the surrounding property. If your home needs cleaning but you’re worried about the lawn around it, contact Coast Pressure Clean for a free quote and discuss your concerns with the team before work begins.

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