Have you recently noticed mould spots appearing on your windows, curtains, or other areas around the house? You’re not alone. Mould is more than just unsightly—it can also be harmful to your health. Understanding the causes of mould and learning how to effectively treat and prevent it are the first steps to maintaining a healthier, cleaner home environment.

What Causes Household Mould?

Mould spores are present everywhere, both indoors and outdoors. When they find a dark, damp environment, they begin to grow and spread, a process known as colonisation. During the colder months, several factors contribute to mould growth inside homes:

• Shorter days and reduced natural sunlight

• Limited airflow as windows remain closed

• Condensation on windows and sometimes walls due to temperature differences indoors and outdoors

• Moisture from daily activities such as hot showers and clothes drying

Where Mould Commonly Grows

Mould thrives in poorly ventilated areas. Curtains, carpets, bedding, and upholstered furniture are common breeding grounds, as are window frames and bathroom ceilings where condensation builds up.

How to Treat Visible Mould

1. Walls and Ceilings
For small areas of mould:

• Spray with a solution of two parts water and one part white vinegar, or use one teaspoon of tea tree oil diluted in one cup of water.

• Leave for at least one hour, then re-spray and wipe clean.

• For stubborn stains, use sugar soap or, once mould has been killed, a chlorine-based cleaner.

Important note: Bleach does not kill mould—it only masks stains. Always treat the mould first with vinegar or tea tree oil before addressing discoloration.

2. Curtains, Blinds, and Drapes
Soak in a solution of an oxygen-based stain remover (e.g., Nappy-San or Vanish Oxy-Action) with half a cup of vinegar for 4–6 hours. Wash on a delicate cold-water cycle to remove spores and stains.

3. Soft Toys
Soak in hot water with one cup of vinegar or a tablespoon of tea tree oil, plus a small amount of oxygen stain remover and dishwashing detergent. Rinse well and dry in direct sunlight.

4. Lounges, Carpets, and Rugs
Professional cleaning is the most effective solution for stains. However, spraying a mix of one cup white vinegar and two cups water can help slow mould growth. If mould is found on carpets, inspect the subfloor for moisture.

5. Bedding
Wash duvets and blankets in hot water with either one cup vinegar or a tablespoon of tea tree oil. For persistent stains, soak with an oxygen-based stain remover. Pillows and mattresses with mould should be replaced, as spores may grow deep within the padding.

Preventing Mould from Returning

Eliminating mould completely can be difficult in winter, but prevention measures can make a big difference:

• Allow natural sunlight into your home whenever possible.

• Improve airflow by opening windows regularly.

• Use desiccant dehumidifiers (e.g., DampRid) in cupboards or closed areas.

• Invest in an electric dehumidifier if mould is a recurring issue.

• Act early—treat small mould spots before they spread.

Final Thoughts
Mould is a common household issue, particularly during colder months when conditions for growth are ideal. By understanding the causes, treating affected areas correctly, and following preventative measures, you can keep your home fresh, clean, and healthier for your family.