Mould is more than an unsightly nuisance – it can damage your home and affect your health. Fortunately, you don’t need harsh chemicals to tackle it. Borax, a naturally occurring mineral, offers a safe, effective, and inexpensive solution for killing mould on contact while preventing regrowth. In this guide, we’ll walk you through exactly how to use borax, then explore three additional powerful methods – including dehumidifiers – to keep your home mould-free for good.
What Is Borax and Why Does It Work Against Mould?
Borax (sodium borate) is a naturally occurring alkaline mineral with a pH of around 9. This high alkalinity disrupts mould’s cell structure, killing it outright. Unlike bleach, which only treats the surface and evaporates quickly, borax leaves behind a protective residue that continues to inhibit future growth. It’s especially useful on non-porous surfaces like tiles, glass, and painted walls, and it works well on wood too.
How to Use Borax to Kill Mould: Step-by-Step Guide
- Mix the solution – Combine 1 cup of borax with 1 gallon (about 4 litres) of hot water. Stir until fully dissolved.
- Prepare the area – Ventilate the room, wear gloves and a mask, and vacuum loose mould spores with a HEPA-filtered vacuum if possible.
- Apply – Pour the mixture into a spray bottle and generously coat the affected area. Let it sit for 5–10 minutes (or up to an hour for stubborn spots).
- Scrub – Use a brush or toothbrush to remove all visible mould.
- Wipe and dry – Wipe away excess residue but do not rinse – the remaining borax film keeps mould from returning. Allow the surface to air-dry completely. Repeat if needed.
Safety note: Borax is low-toxicity but can irritate skin or eyes and is harmful if swallowed. Keep it away from children and pets, and test on a small area first. For large infestations or porous materials like drywall, consult a professional.
Three More Effective Ways to Get Rid of Mould
Borax is excellent for direct treatment, but combining it with moisture-control and natural cleaners gives you a complete defence.
1. Dehumidifiers – Starve mould of the moisture it craves Mould thrives above 60 % humidity. A good dehumidifier lowers indoor levels to 30–50 %, stopping mould before it starts. Place one in problem areas like bathrooms, basements, or kitchens and run it daily. Empty the tank regularly and clean the filter to keep it working efficiently. This preventive approach is one of the most powerful long-term solutions.
2. White vinegar – A natural antifungal spray Undiluted white vinegar kills up to 82 % of mould species thanks to its acetic acid. Simply spray it straight onto the mould, let it sit for at least one hour (no rinsing needed at first), then scrub and wipe. It’s odourless once dry, non-toxic, and safe on most surfaces. Pair it with borax for extra power on tough jobs.
3. Baking soda – Gentle abrasive and moisture absorber Baking soda deodorises, absorbs dampness, and physically scrubs away mould. Mix 1 teaspoon of baking soda with 2 cups of water in a spray bottle, or combine it with vinegar to create a foaming paste for heavier buildup. Apply, let it dry for an hour, then scrub. It’s perfect for porous surfaces and leaves no harmful residue.
Quick Prevention Tips for Lasting Results
- Fix leaks and improve ventilation (open windows, use extractor fans).
- Clean regularly with the methods above.
- Choose mould-resistant paint in high-moisture rooms.
By combining borax for targeted treatment, a dehumidifier for prevention, and vinegar or baking soda for everyday cleaning, you can reclaim your home from mould without harsh chemicals. Start small, stay consistent, and enjoy a fresher, healthier living space.
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