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Is Bathroom & Shower Cleaner safe for polished stone?Updated 7 hours ago

TL;DR: Generally yes on sealed stone, but always spot test first. Bathroom & Shower Cleaner is mildly alkaline at pH 8 and non-abrasive, which is gentler than the acidic cleaners that actively etch calcium-based stone. Sealants vary across stone types and ages though, and unsealed or porous stone can react unpredictably. Spot test in a hidden area, keep contact time short, and rinse thoroughly. For cherished or expensive stone, check the supplier's care instructions first.


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Koh Bathroom and Shower Cleaner in a bathroom
Koh Bathroom and Shower Cleaner on common bathroom problems

Is Bathroom & Shower Cleaner safe for polished stone?

Generally yes on sealed marble, granite, travertine, limestone and engineered stone when used as directed. Bathroom and Shower Cleaner is mildly alkaline at pH 8 and non-abrasive, which is gentler than acidic cleaners such as vinegar, lime removers and descalers that actively etch calcium-based stone. Spot test first every time, keep dwell time short, and rinse thoroughly. Sealants and stone porosity vary, so caution always applies, and for heritage or expensive stone check the stonemason or supplier's own care instructions before you use anything on it.

✓ Generally safe on sealed stone

Sealed marble, granite, travertine, limestone and engineered quartz. Bathroom & Shower Cleaner is mildly alkaline at pH 8 and non-abrasive, gentler than acidic descalers or scouring cleaners. Spot test first, keep dwell short, rinse thoroughly.

Sealed marble Sealed granite Engineered stone Short dwell

When should I avoid using it on stone?

Skip Bathroom and Shower Cleaner on unsealed or porous stone, on old or worn sealants, typically five years or more without re-sealing, on honed or matte finishes where any residue is visible, and on stone whose history you are not sure about. For heritage stone or expensive worktops, ask the stonemason or supplier for their approved care products. When in doubt use a dedicated stone-safe cleaner or plain water on a microfibre, and save Bathroom and Shower Cleaner for the surrounding tiles and fixtures.

⚠ Skip on these

Unsealed or porous stone. Old or worn sealants, typically five years or more without re-sealing. Honed or matte finishes where residue shows. Heritage or bespoke stone, where you should check with the stonemason. Anything you are not confident about. In those cases use a dedicated stone-safe cleaner or plain water on a microfibre, and save Bathroom & Shower Cleaner for the surrounding tiles and fixtures.

Unsealed stone Old sealants Honed finishes Heritage stone

How do I spot test on stone?

Pick an inconspicuous area such as the corner of a tile, under a basin lip or the edge of a worktop. Spray Bathroom and Shower Cleaner, wait sixty seconds and no longer, rub gently with a soft microfibre, rinse with water and dry with a clean cloth. Check closely for dulling, discolouration, etching or texture change. Then check again after twenty-four hours, because some reactions appear slowly. If the test patch still looks identical to the surrounding stone after a day, you are clear to go wider.

✓ Four-step spot test

1

Pick a hidden spot. Corner of a tile, under a basin lip, edge of a worktop. Somewhere you would not mind if the test went wrong.

2

Spray, wait sixty seconds, rub gently. Soft microfibre only. No scrubbing, no abrasive pads.

3

Rinse and dry. Water rinse, clean dry cloth. Look at the spot under good light for dulling, discolouration or etching.

4

Check again in twenty-four hours. Some reactions appear slowly. If the patch still matches the surrounding stone after a day, you are clear.


What is the method for cleaning stone?

Once you have spot tested and confirmed it is safe, spray Bathroom and Shower Cleaner onto a soft microfibre rather than directly onto the stone, wipe gently, rinse with a clean damp cloth and dry. Applying to the cloth rather than the surface keeps contact time short and stops product pooling in seams or running into unsealed edges. Never let the product dry on stone, and never leave it to dwell the way you would on tiles or glass.

✓ Stone method

Spray onto a soft microfibre rather than directly onto the stone. Wipe gently. Rinse with a clean damp cloth. Dry. Applying to the cloth keeps contact time short and stops product pooling in seams or running into unsealed edges. Never let it dry on the stone, and skip the long dwell you would use on tiles or glass.

Spray the cloth Wipe gently Rinse and dry

Koh Bathroom and Shower Cleaner 1.8L

Bathroom & Shower Cleaner

Mildly alkaline at pH 8 and non-abrasive, rather than the acidic chemistry that etches calcium-based stone. Twelve ingredients, made in Australia.

Koh Universal Cloths 3pk

Universal Cloths 3pk · soft microfibre only

Stone wants a soft cloth and nothing else. Spray the cloth, wipe gently, then rinse and dry with a second clean one.

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Last reviewed: August 2026 · Koh UK

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