Enabling change in our Society, Environment and Economy (SEE)

Is Household Mould Affecting You?

Killing Mould the Natural Way

Mould and mildew are generally seen in the rainy months when there is a lot of moisture in the atmosphere. Giving out a bad odour, mould can ruin your house, by making it look unattractive and causing wood to rot. Over time, mould can weaken the walls, ceilings, and furniture, effectively destroying them. If the mould is not treated swiftly, it can cost a fortune to get a professional mould cleaner to disinfect and sanitise your home. Yet, often treating mould naturally is more beneficial to the home environment.

Ways to Kill Mould

While chemicals are an effective weapon against mould, they are also harmful and can destroy the surfaces on which they are applied. They also leave a lasting odour that can cause irritation to the eyes, lungs and skin. Although mould can cause conditions such as eczema, wheezing, and nasal infections, using chemicals to treat problem areas can often do more harm than good.

The other alternative is to use natural methods of killing mould, which are safe to apply on various surfaces.

Let us look at these organic methods.


Vinegar has a pungent odour and is slightly acidic in nature. Hence, it is a good disinfectant and is safe to use as a mould killer. While you can add water to dilute the vinegar, it is best used when you apply undiluted vinegar on the affected area from a spray bottle. Leave it for a few hours and brush off the mould. Various studies have shown that vinegar kills 82% of the mould spores. If sprayed on a dry surface, they can even prevent the appearance of mould.

Tea-Tree Oil

A slightly expensive method, though eco-friendly, is to use tea-tree oil for disinfecting areas affected by mould. Tea-tree oil has a very strong scent so two teaspoons of the oil mixed with two cups of water is sufficient for you to clean a very large surface. Add the mixture of tea-tree oil and water and spray it on the affected area. The mould will disappear after a few days, and you need not rinse the area.

Extracts of Citrus Seed and Water

You can use the extract of citrus seeds (such as orange or grapefruit) mixed with water to kill mould. Around 20-drops of the seed extract should be diluted with 2 cups of water to prepare the mix. Pouring it into a spray bottle and apply to the affected area.

Baking Soda

Baking soda is a natural disinfectant and is very mild. Dissolve the baking soda in water to prepare a solution and spray it on the affected surface. After about half an hour, scrub the mould and then wipe the area with a damp cloth. Since baking soda is mild, it does not leave any strong odour after application.


With thanks to our


  • ACT Government Environment and Planning
  • The Association of Independent Schools of the ACT (AISACT)
  • Catholic Education Office (Archdiocese of Canberra and Goulburn)
  • Education and Training Directorate
  • ACT Government