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How do I use Diamond Sponges?Updated 16 days ago

TL;DR: Diamond Sponges are a powerful abrasive tool. Dampen with Universal Cleaner, rub gently in circles on the target area, and wipe residue with a Universal Cloth. Always spot test first. Avoid plastic, chrome, stainless steel, and some types of glass.

Last reviewed: April 2026

Koh Diamond Sponges 4pk
Koh Diamond Sponge before and after

How do I use Diamond Sponges?

Spray Universal Cleaner directly onto Diamond Sponge to dampen it, then rub gently in a circular motion on the target area. Add more Universal Cleaner onto the surface as you go, and wipe residue with Universal Cloth. Repeat as required. Always spot test first and avoid vigorous scrubbing on any finish.

1

Dampen the sponge. Spray Universal Cleaner directly onto Diamond Sponge.

2

Rub gently in circles. Apply to the target area with light pressure to start. The silica alumina coating does the work.

3

Wipe and repeat. Spray more Universal Cleaner onto the surface as you go. Wipe residue with Universal Cloth. Repeat as required.

What are Diamond Sponges best used for?

Diamond Sponges tackle tough jobs that regular cloths and sponges can't. Best for hard water marks on shower screens, soap scum on bathroom tile, baked-on residue on oven racks and cooktops, and stubborn build-up on ceramic, porcelain, and glazed tile. Think of it as a targeted scour-block for trouble spots, not an everyday cloth.

Koh Diamond Sponge in use

Best for stains

Hard water marks, soap scum, baked-on food residue, and grease build-up where regular cloths and sponges have given up.

Hard water Soap scum Baked-on residue

Best for surfaces

Ceramic and porcelain tile, glazed bathroom walls, porcelain sinks, oven racks, and cooktop surfaces. Always spot test first.

Ceramic Porcelain Glazed tile Oven racks

Which surfaces should I avoid with Diamond Sponges?

Skip plastic, chrome, stainless steel, and some types of glass. The silica alumina coating is highly abrasive, so softer finishes will scratch. Always spot test in a hidden corner before committing to the full clean, and rub gently rather than vigorously. If you see any change in finish, stop and switch to a softer tool.

⚠ Softer finishes

Plastic, chrome, stainless steel, acrylic, and some types of glass will scratch. Painted surfaces, polished timber, and unsealed stone are also off-limits.

No plastic No chrome No stainless steel

⚠ Spot test and go gentle

Always spot test in a hidden corner first. Use light pressure and stop immediately if you notice any dulling, scratching, or change in finish. Abrasion damage cannot be undone.

Spot test first Light pressure
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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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