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Do Loo Cleaner Tabs have a fragrance?Updated 2 hours ago

TL;DR: No. Loo Cleaner Tabs are fragrance-free. No added perfumes, no synthetic scents, no masking agents, and Sensitive Choice approved. If you prefer an added scent, drop two to three drops of essential oil into the bowl alongside the tab. Never add essential oils to the cistern tank.


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Koh Loo Cleaner Tabs fragrance-free formula
Koh Loo Cleaner Tabs in a bathroom

Are Loo Cleaner Tabs fragrance-free?

Yes. Koh Loo Cleaner Tabs are fragrance-free. The formula contains no added perfumes, no synthetic scents, and no masking agents. Most mainstream toilet cleaners use heavy fragrance to cover the chemical smell of their cleaning ingredients. Koh's oxygen-based formula is inherently lower in odour than chlorine-based alternatives, so there is no harsh chemical smell to mask in the first place. The fragrance-free formula is one of the reasons Koh Loo Cleaner Tabs hold Sensitive Choice approval. The product suits sensitive noses, allergy-prone households, asthma sufferers, and anyone who simply prefers a cleaner with no added scent.

Nothing added to hide anything

No perfumes. No masking agents. No synthetic scents. The oxygen-based formula is inherently low in odour, so there is nothing to mask. Sensitive Choice approved.

Fragrance-free No perfumes No masking agents Sensitive Choice

What does the bowl smell like during cleaning?

During cleaning you will notice a faint clean fizz as the tab dissolves in the water. Most customers describe the smell as fresh and slightly mineral, a bit like sparkling water. It is not chemical, not perfumed, and not sharp. Once the solution has sat and you flush, the bowl is left with no lingering scent at all. If you are used to the smell of chlorine bleach toilet cleaner, the absence of a strong scent can take a few cleans to register as clean, because many of us have learned to read that bleach smell as proof of a job done.

A faint clean fizz, nothing harsh

The fizzing smells fresh and slightly mineral, like sparkling water, rather than chemical or perfumed. Once flushed, the bowl is left with no lingering scent. If you are used to bleach-cleaner smell, the absence of a strong scent can take a few cleans to feel normal.

Fresh fizz No chemical smell No lingering scent

Can I add a scent to the Loo Cleaner Tab?

Yes. Drop two to three drops of your favourite essential oil straight into the toilet bowl alongside the Koh Loo Cleaner Tab. Koh's Eucalyptus Oil is fresh and clean, and Lemon Scented Tea Tree Oil gives a citrus-fresh scent that comes from the tea tree leaves rather than from lemon oil. Two to three drops is plenty per clean. Adding more does not make the scent stronger and risks leaving an oily residue on the bowl surface. Add the oil to the bowl water at the same time as the tab, let everything dissolve and fizz together, scrub, let it sit, then flush. Add the oil to the bowl only, never to the cistern tank.

How to add a scent

Two to three drops of essential oil into the bowl alongside the tab. Koh's Eucalyptus Oil and Lemon Scented Tea Tree Oil both work well. Add to the bowl water only, let everything dissolve and fizz together, scrub, let it sit, then flush.

Two to three drops max Bowl only More is not stronger
Koh Eucalyptus Oil

Eucalyptus Oil

Fresh and clean. Two to three drops in the bowl alongside the tab.

Koh Lemon Scented Tea Tree Oil

Lemon Scented Tea Tree Oil

Citrus-fresh scent from the tea tree leaves themselves, not from lemon oil.

More on that scent in Does Lemon Scented Tea Tree Oil contain lemon oil?.


Can I add essential oils to the cistern tank?

No. Never add essential oils to the cistern tank. Essential oils do not dissolve in water and can build up on the rubber seals, the flapper valve, and the fill valve inside the cistern, causing them to degrade or warp over time. That leads to leaks, running toilets, and plumbing repairs. This is different from the cistern method for the Loo Cleaner Tab itself. The tab can go in the cistern, because it dissolves cleanly in water and rinses straight out. Oils do not. If you want a scented clean, drop the oils in the bowl alongside the tab and follow the bowl method, and keep the cistern method fragrance-free.

Never add essential oils to the cistern tank

Oils do not dissolve in water and can build up on the rubber seals, flapper valve, and fill valve inside the cistern, leading to leaks and running toilets. The tab itself is fine in the cistern, because it dissolves cleanly in water. Oils are not. Keep oils in the bowl only.

Oils in the bowl only No oils in the cistern Protects rubber seals

Koh Loo Cleaner Tabs 14 pack

Loo Cleaner Tabs 14pk

Fragrance-free and Sensitive Choice approved. Add your own scent in the bowl if you want one.

Koh Loo Blade with ceramic pot

Loo Blade

The compatible scrub tool. TPE blade with a handmade ceramic pot for storage.

Browse all Loo Cleaner Tabs articles

Last reviewed: August 2026 · Koh UK

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