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Is Kitchen Grease & Oil Cleaner safe on stone benchtops?Updated 7 hours ago

TL;DR: Kitchen Grease & Oil Cleaner is safe on sealed stone worktops including engineered quartz and sealed granite. Spot test it on marble, polished stone, limestone, and travertine, these natural stones can etch or dull over time even with mild alkaline cleaners. Spot test first to confirm compatibility with your specific sealant and finish.


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Is Kitchen Grease & Oil Cleaner safe on stone benchtops?

Kitchen Grease & Oil Cleaner is safe on sealed stone worktops, this includes engineered quartz (Caesarstone, Silestone, Quantum Quartz, etc.), sealed granite, sealed slate, and most modern composite stone worktops. Avoid using it on marble, polished stone, limestone, and travertine. These are acid-sensitive natural stones that can etch, dull, or discolour over time even with mild alkaline cleaners like Kitchen Grease & Oil Cleaner. The damage may not show immediately but accumulates with repeated use. For other natural stones like granite, slate, and sandstone, the answer depends on your specific sealant and finish, spot test first to confirm. The pH of Kitchen Grease & Oil Cleaner is 8.5 (mildly alkaline), which is gentle enough for most surfaces but can still affect highly acid-sensitive stone over time. If you're not sure what type of stone you have, contact your stone supplier or installer.

✓ Generally safe

Sealed stone worktops handle Kitchen Grease & Oil Cleaner well. The mild pH (8.5) and rinse-clean formula don't damage modern engineered stone or sealed surfaces.

Engineered quartz Caesarstone Silestone Sealed granite Sealed slate

⚠ Spot test first

For other natural stones, the answer depends on your specific sealant and finish. Spot test first (see below) to confirm before regular use.

Unsealed granite Unsealed slate Sandstone Composite finishes

How do I spot test before using?

Four-step spot test method. Step 1: Apply a small amount of Kitchen Grease & Oil Cleaner to an inconspicuous area, the back corner of the worktop, an offcut from installation, or a hidden underside section works well. Step 2: Leave the product on the surface for about one minute. Step 3: Wipe and rinse thoroughly with clean water and dry with a soft cloth. Step 4: Check the area carefully for any dulling, discolouration, etching, or surface change. If no changes occur, the cleaner should be suitable for your surface. If you see any change, don't use it on this surface, choose a pH-neutral stone-specific cleaner instead. Spot test on a dry surface in good natural light for the most reliable assessment.

✓ Four steps

1

Apply. Apply a small amount to an inconspicuous area. The back corner, an installation offcut, or a hidden underside works well.

2

Wait. Leave the product on the surface for about one minute.

3

Rinse and dry. Wipe and rinse thoroughly with clean water, dry with a soft cloth.

4

Check carefully. Look for dulling, discolouration, etching, or any surface change in good natural light. If no changes, suitable for use. If any change, choose a pH-neutral stone-specific cleaner instead.

Koh Kitchen Grease and Oil Cleaner bag-in-box

Kitchen Grease & Oil Cleaner

pH 8.5, mildly alkaline. Safe on sealed stone worktops. Dermatest tested.

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Last reviewed: July 2026 · Koh UK

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