How much mould spray do you need and how often? Size guide for 500ml, 1L and 5L, plus the light weekly maintenance routine that makes a bottle last.
How much mould spray do I need, and how often should I use it?
Short version: buy the smallest size that covers your bathrooms, because this is a light weekly maintenance spray, not something you drench a room in. For one bathroom, a 500ml bottle lasts a long time; for a whole house or multiple properties, size up. Used as intended — a light mist once a week — a little goes a long way.
Which size should I buy?
Match the size to how many wet areas you're maintaining, not to how bad the mould looks today. The Clove & Eucalyptus Mould Spray comes in 500ml ($20.50), 1L ($37.00) and 5L ($145.00), and there's a 100ml sample size if you just want to try it on one stubborn seam first. A single ensuite or family bathroom is well served by the 500ml — because you're applying a light mist to grout and silicone rather than soaking the walls, one bottle covers many weekly cleans. A larger home with two or three bathrooms is where the 1L earns its place, and the 5L is really for cleaning businesses, Airbnb hosts and multi-property owners refilling trigger bottles across a run of jobs. The per-litre value improves as you size up, so if you know you'll keep using it, the bigger bottle costs less over time.
How often should I actually use it?
Once a week, lightly, after the first proper clean. The first application deals with the visible mould you already have; after that, a quick weekly mist is maintenance that stops new spores establishing. That cadence is the whole idea behind the product — it's a maintenance spray, not a crisis fix. Clove oil's active compound, eugenol, is a documented natural antifungal (Pinto et al., 2009, Journal of Medical Microbiology), and using it regularly is what keeps the black line from getting a foothold back. Skip weeks and you're back to reacting to growth; keep the rhythm and "clean" becomes the default state of your shower. Two minutes a week beats an hour every fortnight.
How do I make a bottle last?
Apply it as a light, even mist — contact, not run-off — and only where mould actually grows: grout lines, silicone seals and tiles. Flooding the surface wastes product and doesn't kill any better, because it's the clove oil making contact and dwelling ~20 minutes that does the work, not the volume you spray. Keep the surface dry-ish before you spray so you're not diluting it with standing water, and squeegee afterwards so the room dries and needs less product next time. Used this way, even a 500ml bottle stretches across months of weekly maintenance on a single bathroom. One honest note on value: the spray keeps mould from returning with regular use, but it won't restore silicone that's already stained through — if a seam is permanently discoloured, factor a one-off re-caulk into your budget, then maintain the fresh bead weekly.
| Situation | Suggested size | Price |
|---|---|---|
| Try it on one seam first | 100ml sample | Sample size |
| One bathroom / ensuite | 500ml | $20.50 |
| Whole home (2–3 bathrooms) | 1L | $37.00 |
| Cleaners, Airbnb, multi-property | 5L | $145.00 |
We've been distilling eucalyptus oil in Australia since 1895 — five generations — and we'd rather you bought the right size once than the wrong size twice. There's a lifetime money-back guarantee behind the range, so trying the sample carries no risk. A verified reviewer in Melbourne stuck with the routine and got the result: "Very effective, easy to use. Follow the directions and to date the mould has not resurfaced."
Frequently asked questions
What size mould spray do I need for one bathroom?
A 500ml ($20.50) is plenty for a single bathroom, because it's applied as a light weekly mist rather than a soaking. Size up to 1L for a whole home.
How often should I use the mould spray?
Once a week as light maintenance after the first clean. Regular use is what stops the mould re-establishing.
Is there a way to try it before committing?
Yes — there's a 100ml sample size, and the range carries a lifetime money-back guarantee.
Which size is best value?
Per litre, the larger bottles cost less. The 5L suits cleaners and multi-property owners; most households do well on 500ml or 1L.
Buy the size that fits your bathrooms, spray lightly once a week, and one bottle goes further than you'd expect. Read next: how to use the spray (scrub or leave?), the fastest way to clean shower mould between guests, 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.