Is Universal Cleaner fragrance-free?Updated 3 days 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.
Last reviewed: April 2026
Is Universal Cleaner scented?
No. 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 Universal Cleaner is Sensitive Choice approved — better for people with asthma, eczema, fragrance sensitivities, and chemical sensitivities.
✓ Fragrance-free by design
No added perfumes, essential oils, or masking agents. Better for asthma, eczema, and fragrance-sensitive households. GECA eco-certified and Sensitive Choice approved.
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 Universal Cleaner. Give it a gentle swirl to combine. Lemon Scented Tea Tree Oil is Koh's own blend, formulated to pair well with the alkaline formula. Other essential oils work too — lavender, eucalyptus, peppermint are popular picks.
✓ 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.
What if my atomiser stops spraying after I add oil?
Too much oil has likely dislodged the internal tube. 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. Dilute the bottle contents with a fresh refill of Universal Cleaner if the oil concentration is still too high.
✓ Quick fix
Unscrew the spray head from the bottle.
Check the small plastic tube inside. Press it firmly back onto the base of the nozzle if it's come loose.
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's own essential oil blend. Formulated to pair with Universal Cleaner. A few drops scents a full bottle.
Fragrance-free. Add your own scent, or use it as-is. 20+ cleaning jobs in one box.
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