Koh UK logo
Koh UK logo
All articles

Is Universal Cleaner fragrance-free?Updated 5 hours ago

TL;DR: Universal Cleaner is 100% fragrance-free. No perfumes, no masking agents, no essential oils. If you prefer a scent, add 2 to 3 drops of essential oil to your spray bottle. Eucalyptus Oil is Koh's own essential oil and pairs cleanly with the alkaline formula. More than a few drops can interfere with the atomiser spray mechanism.


Read on ↓

Koh Universal Cleaner safe for homes and surfaces
Koh Universal Cleaner product features

Is Universal Cleaner scented?

No. Koh Universal Cleaner is 100% fragrance-free by design. The formula is just two ingredients: potassium hydroxide and reverse osmosis water. No perfumes, no essential oils, no masking agents. This is why Koh Universal Cleaner holds Allergy UK certification and is independently verified by GECA (Good Environmental Choice Australia), Sensitive Choice (National Asthma Council of Australia), and the Eczema Association of Australasia. The fragrance-free formulation makes it better for households with asthma, eczema, fragrance sensitivities, chemical sensitivities, or anyone who prefers their cleaning products to be unscented.

✓ Fragrance-free by design

No added perfumes, essential oils, or masking agents. Better for asthma, eczema, and fragrance-sensitive households. Allergy UK certified and independently verified by GECA (Good Environmental Choice Australia), Sensitive Choice (National Asthma Council of Australia), and the Eczema Association of Australasia.

Fragrance-free Perfume-free Allergy UK Sensitive Choice GECA (Australia)

Can I add a scent to Universal Cleaner?

Yes. Add 2 to 3 drops of essential oil directly to your Atomiser Spray Bottle after filling it with Koh Universal Cleaner. Give it a gentle swirl to combine. Eucalyptus Oil is Koh's own essential oil, formulated to pair with the alkaline formula and to fit a typical atomiser fill. Other essential oils work too. Lavender, lemon, and peppermint are popular choices. Stick to 2 to 3 drops per fill. More than that can interfere with the atomiser spray mechanism by causing the internal dip tube to slip off.

✓ Recommended oil

Eucalyptus Oil is Koh's own essential oil, formulated for use with Universal Cleaner. Fresh, clean herbal scent that pairs well with the alkaline formula. A few drops lasts a full bottle.

⚠ Keep it to 2 to 3 drops

Too much essential oil can cause the internal tube inside the Atomiser Spray Bottle to slip off, which stops the bottle from spraying properly. Stick to 2 to 3 drops per fill and you'll be fine.

Max 3 drops Swirl gently

What if my atomiser stops spraying after I add oil?

Too much essential oil has likely dislodged the internal dip tube inside the Atomiser Spray Bottle. Unscrew the spray head, check that the small plastic tube inside is seated firmly onto the base of the nozzle, and reattach. If the tube looks oily, rinse the spray head with warm water first and let it dry before reattaching. If the bottle still has a high oil concentration, top it up with fresh Koh Universal Cleaner to dilute. Going forward, stick to 2 to 3 drops of essential oil per atomiser fill to avoid the issue.

✓ Quick fix

1

Unscrew the spray head from the bottle.

2

Check the small plastic tube inside. Press it firmly back onto the base of the nozzle if it has come loose.

3

Rinse and dilute if needed. If the tube is oily, rinse the head under warm water, dry, and reattach. Top up the bottle with fresh Universal Cleaner to dilute.

Koh Eucalyptus Oil

Eucalyptus Oil

Koh's own essential oil. Formulated to pair with Universal Cleaner. A few drops scents a full bottle.

Koh Universal Cleaner 2L

Universal Cleaner

Fragrance-free. Add your own scent or use it as-is. 20+ cleaning jobs in one box.

Browse all Universal Cleaner products

Last reviewed: May 2026 · Koh UK

koh universal cleaner fragrance free uk, koh universal cleaner is it scented, koh universal cleaner does it smell, koh universal cleaner odour, koh universal cleaner scent, koh universal cleaner scented, koh universal cleaner unscented, koh universal cleaner perfume free, koh universal cleaner no fragrance, koh universal cleaner no perfume, koh universal cleaner no scent, koh universal cleaner no smell, koh universal cleaner natural smell, koh fragrance free cleaner, koh universal cleaner sensitive, koh universal cleaner asthma friendly, koh universal cleaner eczema friendly, koh universal cleaner allergy, koh universal cleaner allergy friendly, koh universal cleaner allergy uk, koh universal cleaner allergy uk certified, koh universal cleaner sensitive choice, koh universal cleaner geca, koh universal cleaner eczema association, koh universal cleaner essential oil, koh universal cleaner add scent, koh universal cleaner add fragrance, koh universal cleaner add essential oil, koh universal cleaner can i add scent, can i add essential oil to koh, how many drops of essential oil in koh, koh eucalyptus oil, koh eucalyptus oil universal cleaner, koh recommended essential oil uk, koh lemon tea tree oil, koh lemon scented tea tree oil, koh lemon scented oil, koh universal cleaner lavender oil, koh universal cleaner peppermint oil, koh universal cleaner citrus, koh universal cleaner herbal scent, koh atomiser essential oil, koh atomiser dip tube, koh atomiser internal tube, koh atomiser tube slipping, koh atomiser tube loose, koh atomiser not spraying, koh atomiser not spraying oil, koh atomiser not working essential oil, koh atomiser too much oil, koh atomiser fix, koh atomiser troubleshoot, koh spray bottle not working oil, koh spray bottle internal tube, koh too much essential oil atomiser, does koh universal cleaner smell, is koh universal cleaner scented, is koh fragrance free, is koh sensitive choice, why is koh fragrance free, koh universal cleaner uk delivery, koh british customers

Was this article helpful?
Yes
No