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Which surfaces can I use Diamond Sponges on?Updated 5 days ago

TL;DR: Diamond Sponges work best on tough, hard surfaces like oven walls, grout, stone, cast iron, and stained pots. Avoid glass, chrome, polished stainless, plastic, acrylic, and non-stick coatings. Always spot test in an inconspicuous area if you're unsure.

Last reviewed: April 2026

Koh Diamond Sponge before and after
Koh Diamond Sponge in use on a tough job

Which surfaces are Diamond Sponges safe on?

Diamond Sponges are safe on oven walls, racks, trays, cooktop trivets, burner caps, tile grout, stone pavers, brick BBQ surrounds, heavily stained pot interiors, cast-iron grates, and steel grates. Stick to tough, hard, non-polished surfaces where the abrasive grit can do its work without risking the finish.

✓ Oven and cooktop

Oven walls, racks, trays, and drip pans. Cooktop trivets, burner caps, and grates. Baked-on grease and carbonised residue. Skip the glass oven door and ceramic hobs.

Oven walls Racks and trays Trivets

✓ Tile, stone, and heavy duty

Tile grout, glazed tile, stone pavers, and brick BBQ surrounds. Heavily stained pot interiors, cast-iron pans, and steel BBQ grates. Pair with Universal Cleaner for the lifting work.

Grout Stone pavers Cast iron BBQ grates

Which surfaces need a spot test first?

Spot test on hard-anodised cookware, unglazed ceramics, matte natural stone, and satin or brushed metal finishes. Pressure and angle matter. Too firm and these surfaces can dull, scratch, or mark. Test Diamond Sponge in a hidden corner first with light pressure, and stop immediately if the finish changes.

⚠ Matte and unglazed finishes

Hard-anodised cookware, unglazed ceramic tile, matte natural stone, and concrete can mark under firm pressure. Go light and test first.

Hard-anodised Unglazed ceramic Matte stone

⚠ Brushed and satin metals

Brushed steel appliances and satin finishes can develop swirl marks if the abrasive runs across the grain. Always work in the direction of the brush lines.

Brushed metal Satin finishes Work with the grain

Which surfaces should I never use Diamond Sponges on?

Never use Diamond Sponge on glass, mirrors, ceramic hobs, chrome, polished stainless steel, copper, brass, plastic, acrylic, or fibreglass. These finishes will scratch permanently. Soft metals and coated surfaces like painted walls, polished timber, and non-stick cookware are also off-limits. Swap to a soft cloth or sponge for those jobs.

⚠ Scratch-prone finishes

Glass, mirrors, ceramic cooktops, chrome taps, polished stainless appliance exteriors, copper pots, and brass fixtures will all scratch under the abrasive coating.

No glass No chrome No polished stainless

⚠ Soft and coated surfaces

Plastic, acrylic, fibreglass bath tubs, painted walls, polished timber, non-stick cookware coatings, and enamel. Soft finishes mark instantly and coatings peel.

No plastic No non-stick No painted surfaces
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Diamond Sponges handle the tough jobs regular cloths and sponges can't touch. High-density PU foam with a silica alumina coating.

Koh Universal Cleaner

Pair with Universal Cleaner

Pair Diamond Sponges with Universal Cleaner for lifting power on stubborn stains.

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