5 Environmentally Friendly House Washing Tips

If you want to wash your house the environmentally friendly way and keep your home looking great, check out these 5 hot tips direct from Wellington’s premium house washing company.

After soft washing hundreds of houses, trialling every house washing product on the market on all types of mould across many different surfaces, we’ve thought we’d share the optimal way to keep house exterior surfaces clean without the impact on the environment. 

Wash annually 

There are a ton of great reasons to wash your house, roof, paths and decks more regularly. 

Environmental reasons

  • Less chemicals required 
  • Less water required 
  • Less debris in gutters flowing into 
  • Less harmful mould growth 
  • Less water blaster running time
  • Less breakdown of surfaces due to damage from mould
  • Longer lifespan of surfaces means less paint and resources required in the long run

Even more reasons

  • It will cost you less
  • Your house will look great all year round
  • Your surface and paint warranty conditions will be met
  • Less spiders, less spider webs

Washing your house annually will mean you can wash without harsh chemicals and still achieve a great result. Chemicals are used all too often in house washing because they more easily break down moulds and organic matter that has grown on your house. By washing annually you beat the mould to it.

The trick to a beautifully shiny house without the chemicals is getting there before mould gets established and settles in.  

When mould hasn’t had the chance to build up on the exterior of your home over years and years it just needs a bit of a spray and a light brush and a little soap and the job is done. 

Even if your house looks clean, it pays to go over it thoroughly each year. This removes the small bits of dust and organic matter that mould will sprout from. Giving your paint surfaces years more lifespan without the use of harsh chem. As cliche, as it might be… prevention really, is key!

Wash with biodegradable products

When you’re onto an annual rhythm of washing your exterior, you can happily use an environmentally friendly soap or surfactant whilst still achieving great results. Another GREAT alternative is Sodium Percarbonate, often called oxygen bleach. This works great on mould without the nasty environmental impacts of chlorine bleach or ammonia.

The cheapest place in NZ to buy Sodium Percarbonate


Some more resources 

Fact: the byproducts from chlorine bleach manufacturing take centuries to decompose and have been found in animals and breast milk.


Divert your downpipes when roof cleaning and gutter cleaning

Roof washing should also be carried out annually. Roofing manufacturers’ specifications are typically for annual washing with a light soap solution. Ensure you can disconnect your downpipes so the water, chemicals and sediment from roof washing flow to the ground and not directly into stormwater. 

Ensuring the water goes to the ground lets the earth do its job by filtering out the nasties. 

Unfortunately, roofs left for years get to the point where the manufacturer’s specs are no longer a viable option. The mould is too established and won’t come off with a light wash. 

This is how the roof treatment craze has taken off. The “Spray and walk away mentality” really is damaging to the environment. Biodegradable or PH neutral doesn’t make up for the fact that these treatments are hardcore herbicides and exist to destroy any organic matter in the environment. 

If you do find yourself in a situation where you need to apply a roof treatment, there are two things you should keep in mind. 

  1. Divert all downpipes for the treatment so none of it goes into the storm water 
  2. Once the roof is clean, revert back to manufacturers specs which are annual cleaning with a light soap solution.

Heights and ladder use are involved in roof cleaning, so ensure you have some safety measures in place or contact a professional… Like us!

4. Catch sediment when water blasting / concrete cleaning

Eliminating sediment and other debris from around the home being sent down the waterways is something that’s not hard to do when you’re water blasting or cleaning up around the house. 

Here are a few tips to help you ensure you can keep your waterways healthy and free from muck. 

  • Before you start water blasting, check out where the water and sediment will flow. 
  • Sweep up bigger bits of debris before you start washing 
  • Place gravel bags around 
  • Don’t use harsh chemicals around areas that will flow or rain off into stormwater 



5. House wash in winter

This might not seem like the thing to do but if you wash each year when it’s colder and damper, contaminants and build up of any growth on and around the house will be much softer and easier to clean. Overall you’ll have an easier task and it will be cleaned more effectively. 

Softer dirt and mould means:

  • You’ll be using less water to get the job done 
  • You’ll need less cleaning chemicals
  • You won’t be wasting water in Summer time
  • Cleaning solutions stay wet on the house for longer making it easier to wash and rinse before the sun dries everything out before you’ve finished cleaning (this really helps with window washing).
  • If you’re hiring a company to do your washing you will often get a cheaper price because demand is lower in Winter. You’ll be able to pick your dates and not have to wait for months on end either, which is often the case from October onwards.  

So thanks for reading and we hope everyone who reads this is well equipped to tackle their house wash the most environmentally friendly way. 

If you know anyone who needs a hand with their house wash send them this link and they’ll get $50 off their wash with us 🙂 

Get an instant quote to wash your house today!


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