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Is Universal Cleaner fragrance-free?Updated 19 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. Lemon Scented Tea Tree Oil is formulated for exactly this. More than a few drops can interfere with the atomiser spray mechanism.


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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 Sensitive Choice approval, Allergy UK certification, and Eczema Association of Australasia certification. 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. GECA eco-certified, Sensitive Choice approved, Allergy UK certified, and Eczema Association of Australasia certified.

Fragrance-free Perfume-free Sensitive Choice Allergy UK GECA certified

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. Lemon Scented Tea Tree Oil is Koh's own essential oil blend, formulated to pair with the alkaline formula and to fit a typical atomiser fill. Other essential oils work too. Lavender, eucalyptus, 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

Lemon Scented Tea Tree Oil is Koh's own blend, formulated for use with Universal Cleaner. Fresh citrus scent, 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 Lemon Scented Tea Tree Oil

Lemon Scented Tea Tree Oil

Koh's own essential oil blend. 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.

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Last reviewed: April 2026

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