Bunnings Warehouse

Sign in or sign up

No Bunnings account? Sign up
or
PowerPass customer?
Visit the dedicated trade website
Clean surface after mould prevention and regular maintenance

Overview

Mould can appear anywhere moisture and poor ventilation come together, making bathrooms, laundries and kitchens some of the most common problem areas inside the home. While cleaning visible mould is important, controlling the conditions that allow it to grow is the best way to help prevent it from returning. A few simple maintenance habits can help keep your home cleaner, healthier and mould-free.

Key takeaways

Controlling moisture and improving ventilation are the most effective ways to help prevent mould from returning.

Small patches of surface mould can often be cleaned safely, but widespread mould or mould caused by significant water damage may require professional advice.

Always wear appropriate personal protective equipment and never mix different cleaning products.

If mould keeps returning after cleaning, look for an underlying moisture issue such as condensation, poor ventilation or a leak.

Regular inspection and maintenance of wet areas can help stop mould becoming a larger problem.

Steps

1

Identify problem areas

Start by checking areas that are regularly exposed to moisture, such as bathrooms, laundries, kitchens and around windows. Look for signs of mould growth, condensation, musty odours or dark marks on walls, ceilings, grout, silicone and window frames, especially in areas prone to water damage. Catching mould early will usually make it easier to clean and help prevent it from spreading.

: Identify problem areas like bathroom grout and tiles for mould

2

Clean affected surfaces

Before cleaning, open windows and doors where possible to improve ventilation, then put on gloves, a suitable face mask and safety glasses. Apply a mould cleaner according to the manufacturer's instructions and allow it to work for the recommended time before gently scrubbing the surface with a soft-bristled brush, sponge or cloth. Once the mould has been removed, wipe the area clean and allow it to dry completely.

Avoid mixing different cleaning products, as this can create dangerous fumes. If the mould covers a large area or has resulted from significant water damage, consider seeking professional advice before attempting to remove it yourself.

Apply mould cleaner to affected areas before scrubbing

3

Improve ventilation

Reducing moisture is one of the most effective ways to help control mould indoors. Use exhaust fans during and after showering or cooking, open windows whenever weather permits and leave internal doors open where practical to improve airflow throughout your home and reduce humidity levels.

Cupboards, wardrobes and under-sink cabinets can also trap moisture, particularly if they're packed tightly or located against external walls. Leave a small gap around stored items to allow air to circulate, avoid storing damp clothing or towels, and occasionally leave cupboard doors open to help these enclosed spaces dry out. For areas where moisture tends to build up, such as wardrobes, cupboards or storage spaces, a moisture absorber can help collect excess moisture and keep the area fresher.

If your bathroom doesn't have an exhaust fan, opening a window after showering can help reduce condensation and prevent damp conditions where mould can thrive.

Placing a moisture absorber in a wardrobe to reduce humidity

4

Keep surfaces dry

Wipe down shower screens, tiles, benchtops and windowsills where moisture regularly collects. Repair leaking taps, plumbing or seals as soon as possible to help prevent ongoing dampness and avoid water leaks causing hidden moisture. In humid areas of the home, a dehumidifier can also help reduce excess moisture and make conditions less favourable for mould growth.

Cleaning and drying shower floor tiles around the drain to prevent mould

5

Maintain wet areas

Regularly inspect silicone around showers, baths and sinks, along with grout lines between tiles. If silicone is lifting, cracked or mould has penetrated beneath the surface, it may be time to remove and replace it.

It's also worth checking the rubber door seal on your front-loading washing machine, as moisture and detergent residue can encourage mould growth. Wipe the seal dry after each wash and leave the door slightly ajar between loads to help improve airflow. Keeping these high-moisture areas clean and well maintained will help prevent mould from returning.

Applying mould cleaner to a front-loading washing machine door seal to help prevent mould

6

Stay on top of cleaning

Regular cleaning is one of the easiest ways to help prevent mould from returning. Wipe down high-moisture areas regularly, keep exhaust fan covers free from dust and check for condensation during cooler months when mould is more likely to develop.

If mould repeatedly comes back after cleaning, investigate potential moisture sources such as leaks, inadequate ventilation or persistent condensation rather than continually treating the surface. A little ongoing maintenance can help stop small problems becoming much bigger ones.

Prevent mould with regular maintenance

7

Time for some new sealant?

Noticed mould around your shower or bath sealant? Replacing old or damaged sealant can help remove places where moisture becomes trapped and reduce the chance of mould returning. Check out our guide on how to apply bathroom sealant to help refresh your wet areas and keep them easier to maintain.

8

Frequently asked questions

What causes mould to grow inside the home?
Mould grows when moisture, warmth and limited airflow come together. Common causes include condensation, leaks, poor ventilation and damp surfaces that don't dry properly.

Can I clean mould myself?
Small amounts of surface mould can often be cleaned using a suitable mould remover and appropriate personal protective equipment. If mould is widespread, keeps returning or is linked to major water damage, professional advice may be appropriate.

Why does mould keep coming back after I clean it?
Recurring mould is usually a sign that excess moisture is still present. Check for leaks, poor ventilation, condensation or areas that stay damp for extended periods.

Do moisture absorbers stop mould completely?
Moisture absorbers can help reduce excess humidity in enclosed spaces such as wardrobes and cupboards, but they don't fix underlying moisture problems. Good ventilation and addressing leaks remain important.

When should I replace bathroom silicone?
If silicone is cracked, lifting away from the surface or mould has penetrated beneath it, cleaning alone may not solve the problem. Replacing the silicone can help restore a watertight seal and improve hygiene.
Health & Safety

Asbestos, lead-based paints and copper chromium arsenic (CCA) treated timber are health hazards you need to look out for when renovating older homes. These substances can easily be disturbed when renovating and exposure to them can cause a range of life-threatening diseases and conditions including cancer. For information on the dangers of asbestos, lead-based paint and CCA treated timber and tips for dealing with these materials contact your local council's Environmental Health Officer or visit our Health & Safety page.

When following our advice in our D.I.Y. videos, make sure you use all equipment, including PPE, safely by following the manufacturer’s instructions. Check that the equipment is suitable for the task and that PPE fits properly. If you are unsure, hire an expert to do the job or talk to a Bunnings Team Member.