Those gray or silver streaks on your ceramic plates and bowls aren’t scratches. They’re thin deposits of metal left behind by forks, knives, and spoons dragging across the glaze surface. Because the metal is sitting on top of the ceramic rather than gouged into it, most marks come off easily with a mild abrasive and a little patience.
Why Metal Marks Happen
Every time a metal utensil slides across a ceramic plate, tiny amounts of metal transfer onto the glaze. The rougher the surface, the more metal gets deposited. Research on porcelain tableware published in the journal Materials found that matte and opaque glazes pick up metal marks far more easily than glossy or transparent ones, because the crystalline particles that create that matte texture also create microscopic roughness. Transparent glossy glazes, which lack those crystalline particles, resist metal marking the best.
The good news from that same research: matte glazes that pick up marks easily also tend to release them relatively easily during cleaning. So even if your dishes seem to attract every fork scrape, the marks are usually superficial.
Baking Soda Paste: The Simplest Fix
Mix baking soda with a small amount of water to form a thick paste, roughly the consistency of toothpaste. Apply it directly to the metal marks with a soft cloth or non-scratch sponge and rub in small circles with moderate pressure. The baking soda acts as a gentle abrasive that’s hard enough to lift the metal deposit but soft enough not to damage the glaze underneath.
For light marks, 30 seconds of rubbing is usually enough. Heavier streaks from steak knives or serrated blades may need a couple of minutes. Rinse the dish, check your progress, and repeat if needed. This method works on both glossy and matte finishes and costs almost nothing.
Bar Keepers Friend
If baking soda alone doesn’t cut it, Bar Keepers Friend is the next step up. Its active ingredient is oxalic acid, combined with a fine mineral abrasive. Le Creuset specifically recommends it alongside baking soda paste for removing metal marks from their stoneware. Sprinkle the powder on a damp dish, rub gently with a soft sponge, and rinse thoroughly. The slight acidity helps dissolve the metal deposit while the abrasive lifts it away.
Bar Keepers Friend comes in both powder and liquid soft cleanser forms. Either works. The powder gives you slightly more scrubbing power, while the liquid is easier to spread over large areas. Avoid letting it sit on the surface for more than a minute or two, especially on hand-painted or vintage pieces, since prolonged contact with acidic cleaners can dull some decorative finishes over time.
Cream of Tartar
Cream of tartar is a mildly acidic powder that works similarly to Bar Keepers Friend but is gentler. Make a paste with water, apply it to the marks, and let it sit for a few minutes before rubbing with a soft cloth. This is a good option for delicate or antique dishes where you want to be extra cautious. It’s slower than baking soda or Bar Keepers Friend but effective on lighter marks.
What Not to Use
Steel wool, scouring pads, and abrasive powders like Ajax or Comet are too harsh. They can scratch the glaze itself, creating permanent rough spots that will attract even more metal marks in the future. You’re trying to remove the metal deposit, not sand down the ceramic.
Bleach is another common instinct that won’t help here. It works on organic stains like tea and coffee but does nothing to dissolve metal. On older or decorated pieces, bleach can actually damage gold trim, gilding, and certain enamel finishes. It’s the wrong tool for this particular problem.
Regular dish soap also won’t make a difference on its own. The marks aren’t grease or food residue. You need some form of physical abrasion or mild acid to break the bond between the deposited metal and the glaze surface.
Preventing Metal Marks
You can reduce how often marks appear by choosing dishes with glossy, transparent glazes rather than matte or textured finishes. If you love the look of matte stoneware, marks are simply part of the deal, but they’ll clean up quickly as long as you address them before they build up in layers.
Using higher-quality stainless steel flatware helps too. Softer metals and lower-grade alloys transfer more readily onto ceramic. If you notice one set of utensils leaves marks more than another, the metal composition is the likely reason.
Cutting food directly on a ceramic plate with a knife is the single biggest cause of heavy marking. Using a cutting board for anything that needs slicing keeps your plates cleaner with almost no effort. For everyday fork and spoon marks, a quick scrub with baking soda every few weeks prevents the gray buildup that makes dishes look permanently dingy.