You've spotted something growing in the corner of your bathroom or on the back of a wardrobe door. Is it mould? Is it mildew? Does it even matter?
Actually - yes, it does. While the two are often used interchangeably, mould and mildew are quite different when it comes to appearance, risk, and how you deal with them. Here's what you need to know.
What Is Mildew?
Mildew is a type of fungus that grows on surfaces in damp, humid environments. It tends to stay flat and surface-level, spreading out in a powdery or fluffy texture. Colour-wise, mildew usually presents as white, grey, or yellow - and it's most commonly found on damp fabrics, paper, bathroom tiles, and window sills.
The good news? Mildew is generally easier to deal with. Because it sits on the surface, it can often be cleaned up relatively quickly with the right product.
What Is Mould?
Mould is a more serious form of fungal growth. Unlike mildew, it penetrates deeper into surfaces and can appear in a range of colours - green, black, blue, and even red. It often has a fuzzy or raised texture and can release spores into the air as it grows.
Mould thrives in similar conditions to mildew - moisture, warmth, and poor ventilation - but its impact can be more significant. Left untreated, mould can cause damage to walls, ceilings, soft furnishings, and building materials. It can also affect indoor air quality, which matters especially for families spending a lot of time at home.
| Side-by-Side: The Key Differences | ||
| Mildew | Mould | |
| Appearance | Flat, powdery or fluffly | Raised, fuzzy or slimy |
| Colour | White, grey, yellow | Green, black, blue, red |
| Where it grows | Surfaces - tiles, fabrics, paper | Penetrates deeper into walls, ceilings, materials |
| Severity | Easier to treat | Can be more damaging if left untreated |
| Common locations | Bathrooms, window sills, damp fabrics | Behind walls, under flooring, ceilings, wardrobes |
What Causes Both?
Mould and mildew share the same root cause: excess moisture. In Australian homes, the conditions that allow them to develop include:
- High indoor humidity - especially in bathrooms, laundries, and kitchens
- Poor ventilation and limited airflow
- Condensation on windows and walls
- Damp fabrics, bedding, or stored items
- Water that hasn't properly dried after rain, flooding, or leaks
The key is that neither mould nor mildew can thrive without moisture. Tackle the moisture, and you significantly reduce the risk of both.
Why You Shouldn't Ignore Either
One Mildew might seem like a minor inconvenience, but if left to spread, it can quickly escalate - especially in enclosed or poorly ventilated spaces. Mould, if it takes hold in walls or ceilings, can be far more difficult and costly to address down the track.
Both can also contribute to that persistent musty smell that makes a home feel less fresh, even after cleaning. The best approach? Act early, and prevent before you need to cure.
How to Prevent Mould and Mildew at Home
Prevention comes down to controlling moisture and keeping your spaces fresh. Here are the most effective steps:
- Improve ventilation Open windows when cooking and showering. Use exhaust fans where possible. Good airflow is one of the simplest ways to keep moisture levels down.
- Reduce indoor humidity Using a moisture absorber in enclosed spaces - wardrobes, cupboards, caravans, storage areas - captures excess moisture before it has a chance to settle.
- Address problem areas early If you notice condensation on windows, a musty smell in a room, or any early signs of surface growth, treat it straight away rather than waiting for it to spread.
- Keep air circulating in at-risk areas Bathrooms, laundries, and bedrooms with limited natural light are the most common trouble spots. Regular airing out and using ongoing mould prevention products can make a real difference.
- Treat fabrics and soft furnishings Mildew loves damp fabric. If clothes or linen have been stored in enclosed spaces, a laundry sanitiser can help remove any spores and keep them fresh.
Our Mould Solutions Range
At Allstate Healthcare, we stock a full range of products designed to tackle both mould and mildew - from prevention through to removal.
For active mould and mildew on surfaces:
- Mould Control Spray 500ml RTU — A ready-to-use spray for treating visible mould on hard surfaces. Great for bathrooms, tiles, and walls.
- SAN-AIR Surface Mould Remover 500ml RTU — Effective surface treatment for removing mould where it's already taken hold.
- Natural Mould Wipe - 10 Pack — Convenient for smaller areas or regular spot treatment.
For ongoing prevention in enclosed spaces:
- Mould Control Home Gel 75g — Place this in a room and it continuously works to inhibit mould spores in the air. Ideal for bedrooms, living areas, and anywhere you spend time.
- Mould Control Extra Gel 100g — Same as above, but bigger. Meaning you won’t need to replace it as much!
For mouldy fabrics and laundry:
- SAN-AIR Laundry Machine & Clothes Sanitiser 1 Litre — Tackles mould and mildew spores in washing machines and on clothing.
- PUREFOLIO Laundry Sanitiser Concentrate 500ml — Great for sanitising fabrics that have been stored or exposed to damp conditions.
Not sure where to start?
- Mould Bundle with Mould Control — A great all-in-one starting point for treating and preventing mould at home.
- SAN-AIR DIY Mould and Bacteria Test Kit — Test for mould and bacteria in your home so you know exactly what you're dealing with.
Don't Forget: Moisture Absorbers Are Your First Line of Defence
Treating mould and mildew after they appear is important - but stopping the moisture that causes them in the first place is even better. That's where moisture absorbers come in.
These compact, no-fuss products sit in enclosed or problem areas and silently pull excess humidity from the air before it can settle on surfaces and create the conditions mould and mildew need to grow.
They're ideal for:
- Wardrobes and built-in robes
- Bathrooms and laundries
- Caravans, boats, and vehicles
- Storage areas
- Garages
- Spare rooms
- Any space that feels stuffy or hard to air out
Products we recommend:
- Pingi Reusable Dehumidifier 250g — A reusable, eco-friendly moisture absorber that can be recharged in the microwave or sun once saturated. Great for wardrobes and enclosed spaces.
- Zarpax Moisture Absorbers — Another reliable option, designed to absorb moisture and prevent that musty smell in cars, boats, bags, storage areas and more.
👉 Browse our full Moisture Absorbers range here
The Bottom Line
Mildew is surface-level and easier to tackle. Mould goes deeper and can become a more serious problem if left unchecked. But both have the same cause - excess moisture - and both can be prevented with the right approach.
Stay on top of ventilation, address damp conditions early, and use the right products consistently. Your home will be fresher, cleaner, and healthier for it.