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Why Is Sunshine The Best Way To Kill Mould Naturally?

sun shining through clouds

Uninterrupted sunlight – it may not seem like much, but it just happens to be one of the most effective ways to naturally kill and prevent mould.  

But how exactly does sunlight kill mould? 

And how can you use it to kill mould or stop it from growing? 

Read on to find out.

Does Sunlight Kill Mould?


The type of ultraviolet light that can effectively get rid of mould is UV-C, which happens to be one of the three types of UV radiation produced by the sun. This is the reason sunlight is so effective at killing and preventing mould, and best of all, it does so without the need for harsh chemicals.  

Here’s how: 

  • The short wavelengths of ultraviolet light are germicidal, meaning it can destroy and eliminate both mould and other germs. 
  • The sun’s heat is ideal for drying out mould and moisture on clothes, furnishings and more.  
  • Sunlight kills bacteria that produce nasty mould and mildew smells. 
  • Installing a ultraviolet lamp in a HVAC unit helps keep the entire system free of mould. 

It is important to note that the effectiveness of sunlight on mould depends on the size of the infestation and the duration of UV light exposure. 

Sunlight, Natures Mould Deterrent

There’s a reason you don’t often see mould growing out in the open.  

Mould thrives in damp, dark and humid places, the reason why its commonly seen growing inside cabinets, rooms and basically everywhere with insufficient light. And this provides a clear indication that sunlight is an effective source for preventing mould.  

Simply opening your blinds and curtains and allowing plenty of fresh air will help keep mould from growing in your home.  

Does Indirect Sunlight Kill Mould?

Indirect sunlight is not as effective as direct sunlight for killing mould.  

The sun’s UV rays are weaker in indirect sunlight, so it will not kill mould as successfully. While sunlight through windows is an effective form of prevention, for large or established patches of mould, indirect sunlight won’t be enough to kill it. 

How Long Does It Take For Sunlight To Kill Mould?

It takes at least 1-2 hours for sunlight to kill and dissipate most mould and mildew.

Therefore, it is recommended to leave mould affected items in direct sunlight for at least two hours to ensure effective mould removal.

How To Kill Mould On Clothes And Furniture With Sunlight

Sunlight is an effective way to help prevent and kill mould on items like clothes, pillows and furnishings.  

To kill mould with sunlight: 

  1. Wear a mask, gloves and safety goggles to protect yourself from mould’s toxic spores. 
  2. Scrub off the mould using a toothbrush or scrubbing brush.  
  3. Treat the surface with a commercial mould solution. 
  4. Let the solution sit, then thoroughly wash items. 
  5. Place items in direct sunlight for at least two hours or until dry. 

What About Larger Infestations?

While sunlight can be effective for killing mould on easily portable items, it’s not so great for larger indoor infestations.

For mould in areas that cannot be transported outside like bathroom tiles and bedroom wardrobes, it’s best to call in a professional mould removal service. 

How To Prevent Mould With Sunlight

Don’t wait around for mould to start growing before taking action.  

Poor air quality and high moisture levels are catalysts for mould. So, plenty of sunlight and fresh air is the best way to prevent mould from growing in your home. Ensure blinds and curtains are open during the day and open windows when weather permits.  

Along with sunlight, some other helpful ways to prevent mould growth include:  

  • Use exhaust fans when showering and cooking 
  • Installing an ultraviolet lamp in HVAC systems 
  • Allow fresh and regular airflow throughout the home 
  • Monitor humidity levels with a dehumidifier  
  • Clean spills and flood damage immediately 
  • Identify and fix leaks as soon as possible 

When To Call In The Professionals

If you are afraid of mould becoming a problem in your home and are looking for a long-term solution, be sure to call upon a professional team to help you.

The MouldMen team will inspect, treat and provide you with a Mould Management and Prevention Plan to ensure that your home is kept safe and free from mould. Call us on 1300 60 59 60 to book your free inspection today. 

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