What's actually in a natural mould spray? (and why "fragrance" hides the rest)

If you've ever turned a mould spray bottle around looking for an ingredient list and found almost nothing, that's not an accident. In Australia, cleaning products aren't legally required to disclose their full ingredients, and the word "fragrance" can legally stand in for a long list of undisclosed chemicals. A genuinely natural spray has nothing to hide — so it tells you all five things in the bottle.

What's actually in the Clove & Eucalyptus Mould Spray?

Five ingredients, named in full: water, castile soap, methylated spirits, 100% pure eucalyptus oil, and 100% pure clove oil. That's the entire formula. Water is the carrier; castile soap is a plant-oil-based cleanser that lifts grime; methylated spirits helps the surface dry so you're not leaving moisture behind for the next colony; eucalyptus oil supports mould control and gives the sharp, clean scent; and clove oil does the killing, through its active compound eugenol. There's no chlorine, no caustic soda, and no "fragrance" line hiding a dozen synthetic additives. You can read the whole thing in one breath — which is the point. When a label lists everything, you can actually judge what you're spraying in an enclosed bathroom your family uses every day.

Why can other sprays get away with "fragrance"?

Because disclosure laws for cleaning products are far weaker than most people assume. Unlike food, household cleaners in Australia generally don't have to print a full ingredient list, and internationally the term "fragrance" (or "parfum") is a recognised catch-all that can represent many individual chemicals a manufacturer isn't obliged to name. That's how a bottle can look almost ingredient-free while containing a range of undisclosed compounds. It's legal — and it's exactly why a brand built on transparency lists all five ingredients when it doesn't have to. The gap between "what the law requires" and "what an honest label shows" is the whole argument. If a product's cleaning power came from something it was proud of, it would name it.

How does knowing the ingredients help me choose?

It lets you match the chemistry to the claim instead of trusting a marketing word. With the five ingredients on the table, you can see that the mould-killing here comes from clove oil — and that's a claim backed by evidence, not vibes: eugenol, clove oil's main compound, is a documented natural antifungal shown to disrupt fungal cell membranes and ergosterol synthesis (Pinto et al., 2009, Journal of Medical Microbiology). You can also see what it doesn't contain — no chlorine to fill a small bathroom with fumes, no caustic soda. And you can hold us to the honest limits: it kills mould at the root so it stops coming back with regular use, but it won't bleach out staining that's already soaked into old silicone. A full label is what makes that kind of honesty checkable.

We've been distilling eucalyptus oil in Australia since 1895 — five generations — and in 130 years we've never needed a "fragrance" line to hide what's in a bottle. When your name's been on the label that long, transparency isn't a marketing angle; it's the only way to still be here. A verified reviewer in Melbourne trusted exactly that: "I have tried a lot of mould products in my life, but this has been one of the best. Very effective, easy to use. Follow the directions and to date the mould has not resurfaced."

Frequently asked questions

What's in the Clove & Eucalyptus Mould Spray?

Five ingredients: water, castile soap, methylated spirits, 100% pure eucalyptus oil and 100% pure clove oil. No chlorine, no caustic soda, no undisclosed fragrance.

Why don't other cleaning sprays list their ingredients?

Household cleaners in Australia generally aren't required to disclose full ingredients, and "fragrance" can legally stand in for many unnamed chemicals.

What actually kills the mould in it?

Clove oil, via its active compound eugenol — a documented natural antifungal that disrupts fungal cell membranes (Pinto et al., 2009).

Does a natural spray mean it removes stains too?

No — it kills mould so it stops returning, but it won't bleach out staining already soaked into old silicone. That's a re-caulk.

Read the label, match the chemistry to the claim, and choose with your eyes open. Read next: does clove oil actually kill mould at the root, natural mould spray vs bleach for shower grout, and how to get rid of black mould in grout and silicone for good. Or view the Clove & Eucalyptus Mould Spray.

Reference: Pinto, E. et al. (2009), Journal of Medical Microbiology, 58, 1454–1462.