Clove oil for mould: does it actually work?
Short answer: yes, up to a point. Clove oil contains eugenol, a compound shown in lab research to act against black mould on contact. It works best as a light daily habit in the air, not a one-off scrub. It will not fix damp, and the clove oil on a supermarket shelf is a raw ingredient, not a tested mould product.
This is where the question came from for me. We'd been through a cyclone up here in Queensland. The house stayed shut up for the better part of a month. Windows taped, everything damp. By the third Sunday of wiping the same bathroom skirting with bleach, I'd had enough. Someone in a local group said try clove oil. So I did.
How does clove oil work on mould?
Clove oil's active ingredient is eugenol. In plain terms, black mould builds an outer wall to hold its cells together and keep growing. A 2024 paper in Industrial Crops and Products describes how clove (eugenol) and Litsea Cubeba (citral) disrupt the ergosterol cell wall that black mould (Aspergillus niger) builds to grow. Damage that wall and the cell struggles to hold its shape. That is the mechanism, and it is why clove keeps turning up in mould research while a lot of nicer-smelling oils don't.
Does clove oil actually work on mould?
Eugenol has a real mechanism, but clove oil on its own is a raw ingredient, not a measured formula. What we can point to is tested blends. When we lab tested our own six-oil blend, clove included, it came back lab tested, 99.2% reduction in black mould on direct contact, on a BS EN 13697 surface test. On direct contact is the part that matters. That is the mould you can wipe, not the spores still drifting around the room.
The air is the other half of the problem. In a 2022 UNSW Sydney lab-chamber study in Antibiotics, essential-oil vapour cut 72% of viable Aspergillus spores in 10 minutes. The blend in that study was similar but not identical to ours, so read it as a direction of travel, not a spec sheet. The same oils, worked into the air rather than sprayed on, have also been studied for keeping mould off stored food, including a 2022 study in Foods.
We publish the full lab result and every study on our proof page, so you don't have to take my word for any of this.
Clove oil vs vinegar for mould: which works better?
This is the comparison people actually search for, so let me be fair to vinegar. White vinegar is acetic acid. It is cheap, it is in every kitchen, and its acidity does give it some bite on mould sitting on a surface. For a small patch of grout, a vinegar wipe is hard to beat on price. I'll tell you what it doesn't do. It doesn't touch the spores in the air, and once it has dried, the sour smell is the only thing left, and the smell isn't cleaning anything.
Clove oil is the opposite trade. Higher cost, a stronger and longer-lasting smell, but its eugenol can be worked into the air as well as wiped on a surface. Here they are, side by side.
| Factor | Clove oil (eugenol) | White vinegar (acetic acid) |
|---|---|---|
| How it acts on mould | Eugenol disrupts the mould cell wall on contact | Acetic acid lowers the surface pH on contact |
| Air or surface | Can be scented into the air and wiped on a surface | Surface wipe only |
| Smell | Warm and spicy, lingers for hours | Sharp and sour, fades as it dries |
| Cost | Higher per millilitre | Very cheap |
| Evidence base | Peer-reviewed mechanism and air studies, plus our own lab test on the blend | A genuine home stand-by; the surface acidity is real, the air side is untested |
And bleach, since that is where most of us start. I did too. The US EPA's mould guidance is blunt about it. Verbatim: "The use of a chemical or biocide that kills organisms such as mold (chlorine bleach, for example) is not recommended as a routine practice." That was the line that sent me looking for something I could reach for every week without dreading it.
How do you use clove oil for mould safely?
Two ways, and they suit different jobs. For a surface, dilute a few drops in water, wipe the patch, and don't rinse it straight away. For the air, 5 to 8 drops in a diffuser, 30 to 60 minutes daily, in the worst-affected room. Start low. Clove oil is potent, the smell builds fast, and more is not better.
A few honest cautions. Undiluted clove oil can irritate skin, so wear gloves. Keep it well away from pets and small children, and open a window after you diffuse. That is not medical advice, it is just how you'd treat any strong essential oil. The specifics for our own blend are in our product use and safety information.
Does clove oil stop mould coming back?
Not on its own, no. This is the trade-off nobody selling essential oils likes to say out loud. If the room stays damp, spores from outside will land and start again, clove oil or not. The oil buys you a less hospitable surface and, if you diffuse it, a bit of air-side hygiene between cleans. It does not dry the room out. Fix the moisture first. The fan, the window, the leak. Then the oil is doing maintenance instead of fighting a losing battle. That order of operations is how to stop mould coming back.
Mould is common here, so having it doesn't mean you've done something wrong. Coulburn and Miller's 2022 Australian review notes the last national survey to measure it found almost 18% of Australian homes had mould or mildew.
If you want the plain-physics version of why it grows, and why wiping alone keeps failing, read how mould actually works.
Clove oil for mould: quick FAQ
Is clove oil better than vinegar for mould?
Different jobs. Vinegar is cheaper and fine for a quick surface wipe. Clove oil's eugenol has more research behind it and can be scented into the air, which vinegar can't do. For a one-off patch, reach for vinegar. For an ongoing air-side habit in a damp room, clove oil earns its keep.
How long does clove oil take to work on mould?
On a surface, let it sit rather than rinsing straight away. In the air, the UNSW chamber study measured a 72% cut in viable Aspergillus spores in 10 minutes, though a real room is far bigger and messier than a lab chamber. Treat it as a daily habit, not a stopwatch.
Can I just put clove oil in a diffuser for mould?
Yes, that is the air-side use. 5 to 8 drops, 30 to 60 minutes a day, in the worst room, then open a window. Keep it away from pets and small children. It is maintenance for the air, not a fix for a wet wall.
Will clove oil keep mould from coming back?
No, not on its own. Nothing keeps mould off while the room stays damp. Clove oil helps you hold the line between cleans. Drying the room out is what actually stops it returning.
Related guides
- Do essential oils actually kill mould? What the lab says
- Tea tree oil for mould: how to use it, and where one oil falls short
- How to choose a natural mould spray in Australia
For the natural approach in depth, see our guide to natural mould treatment with essential oils.
Written by Ben, founder of Aurala Naturals. Last updated 28 July 2026.
