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Can I use Bathroom & Shower Cleaner on marble or natural stone?Updated 13 days ago

TL;DR: Generally yes on sealed marble and natural stone, but always spot test first. Bathroom & Shower Cleaner is mildly alkaline (pH ~8) and non-abrasive, which is gentler than acidic cleaners that 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 features
Koh Bathroom and Shower Cleaner before and after

Is Bathroom & Shower Cleaner safe on marble and natural stone?

Generally yes on sealed marble, granite, travertine, limestone, and engineered stone when used as directed. Bathroom & Shower Cleaner is mildly alkaline (pH ~8) and non-abrasive, which is gentler than acidic cleaners (vinegar, lime removers, 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.

✓ Generally safe on sealed stone

Sealed marble, granite, travertine, limestone, engineered quartz. Bathroom & Shower Cleaner is mildly alkaline (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 & Shower Cleaner on unsealed or porous stone, old or worn sealants (typically 5+ years without re-sealing), honed or matte finishes where any residue is visible, and stone you're not sure about the history of. For heritage stone or expensive countertops, ask the stonemason or supplier for their approved care products. Use a dedicated stone-safe cleaner or plain water on a microfibre when in doubt.

⚠ Skip on these

Unsealed or porous stone. Old or worn sealants (5+ years without re-sealing). Honed or matte finishes where residue shows. Heritage or bespoke stone (check with the stonemason). Anything you're not confident about. Use a dedicated stone-safe cleaner or plain water on a microfibre, and save Bathroom & Shower Cleaner for surrounding tiles and fixtures.

Unsealed stone Old sealants Honed finishes Heritage stone

How do I spot test on stone?

Pick an inconspicuous area (corner of a tile, under a basin lip, edge of a benchtop). Spray Bathroom & Shower Cleaner, wait 60 seconds (no longer), rub gently with a soft microfibre, rinse with water, dry with a clean cloth. Check closely for dulling, discolouration, etching, or texture change. Check again after 24 hours. If the test patch still looks identical, you're clear.

✓ Four-step spot test

1

Pick a hidden spot. Corner of a tile, under a basin lip, edge of a benchtop. Somewhere you won't mind if the test goes wrong.

2

Spray, wait 60 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 24 hours. Some reactions appear slowly. If the patch still matches surrounding stone after a day, you're clear.


What's the method for cleaning stone?

Once you've spot-tested and confirmed it's safe, spray Bathroom & Shower Cleaner onto a soft microfibre (not directly onto the stone), wipe gently, rinse with a clean damp cloth, and dry immediately with a soft dry cloth. Don't let moisture sit on stone or pool in grout lines. For weekly maintenance on sealed shower walls, a quick spray and rinse is fine. Apply to the cloth rather than the surface for benchtops and honed finishes.

✓ Four-step cleaning method

1

Spray onto a soft microfibre. Not directly onto the stone. Reduces contact time and prevents pooling in grout lines or porous patches.

2

Wipe gently. Light pressure, soft microfibre only. No abrasive pads, no scouring.

3

Rinse with a clean damp cloth. Water rinse only. Removes any residue before it dries.

4

Dry immediately. Soft dry cloth. Don't let moisture sit on stone or pool in grout lines. Weekly shower walls fine with quick spray and rinse, benchtops always cloth-first.


Koh Bathroom and Shower Cleaner 1.8L

Bathroom & Shower Cleaner · gentle on sealed stone

Sensitive Choice approved, Dermatest tested, Eczema Association recognised. 12 ingredients, pH 8, made in Australia.

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Last reviewed: April 2026


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