Prep first
Before you start
- Identify the cause first: location, smell, feel and how it appeared decide the treatment.
- Test any cleaner on a hidden spot first.
- Brush or vacuum dry soot and mildew before wetting them.
- Rinse thoroughly after every cleaner.
A black mark on dishes, whether a plate, bowl or glass, can be soot, mildew, manganese from well water or greasy film, and the right first move depends on which one it is. Many marks respond to mild soap and warm water once you know the cause. Some are damage rather than dirt, though, and those can fade without ever disappearing completely.
Let dishes still hot from the oven cool first, since heat can set a mark. Microfiber cloths lift grime from glass and ceramic without scratching them. If a mark survives all of that, stop before you try anything harsher on the glass.
Before you start
What dishes & mugs can take
Safe to use1
- Water
Use with care7
- Hot water
- Soaking
- Chlorine bleach
- Solvents (alcohol, spot removers)
- Acids (vinegar, lemon)
- Scrubbing and abrasives
- Heat, once the stain is out
6 items
What you'll need
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- Mild dish soapYour first washing step, mixed with warm water.
- Soft clothWashes the whole dish without scratching the glaze. (opens Amazon)
- Stiff brush or vacuumRemoves dry soot and mildew before any water touches them. (opens Amazon)
- Non-abrasive cleanserFor a mark that won't lift with soap and water alone. (opens Amazon)
- Plastic or nylon scouring padThe only pad to use if scouring is needed. (opens Amazon)
- Chlorine bleachA last-resort step, only for marks that are not manganese or iron. (opens Amazon)
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7 steps
Step by step
Step 1 of 7
Work out what the mark is
Look at where the black mark sits, how it smells and feels, and how it appeared. Those clues show whether the mark is mildew, soot, manganese or greasy residue, and each one is treated differently.
Work through the steps below in order and stop once the mark has lifted.
Step 2 of 7
Test on a hidden spot
Pick a spot that won't show, such as the underside of the foot or the inside of the base. Try the soap or cleaner you plan to use there, then look for dulling, a color change or any damage to the glaze.
Step 3 of 7
Brush off dry soot or mildew
Brush or vacuum dry soot and mildew before you wet them, since water can spread them across the surface. If it's mildew, do the brushing outdoors.
Step 4 of 7
Wash with mild soap and warm water
Wash the whole dish with mild soap, warm water and a soft cloth, not just the mark. Then check whether the mark has lifted before you move on.
Careful. Don't add liquid to a hot dish or move it straight into cold water: sudden temperature changes can break glass and ceramicware.
Step 5 of 7
Scour gently if the mark stays
If the mark is still there, put a non-abrasive cleanser on it and work it with the cloth. If you need to scrub, use only a plastic or nylon pad and keep the pressure light.
Tip. Work in small circles and rinse often, so you can see how the mark is responding.
Step 6 of 7
Rinse well and check again
Rinse the dish thoroughly after any cleaner, since alkaline cleaners may need several rinses. Dry it and check the mark in good light before you decide on the next step.
Step 7 of 7
Use chlorine bleach last, if needed
Only if the mark is not manganese or iron and it's still there after rinsing, dab chlorine bleach onto the mark alone. Rinse the dish again afterwards until no bleach smell or residue remains, since bleach needs several rinses.
Careful. Chlorine bleach intensifies manganese and iron marks, so confirm the cause before you reach for it.
If you'd rather buy than mix
Best products for black stains on dishes & mugs
Choose a non-abrasive cleanser made for glass or ceramic, and skip any product that lists fluorine compounds.
Amazon Basics Microfiber Cleaning Cloths
e-cloth General Purpose Cloth
How we picked these: each product is made for this type of stain, its maker doesn't warn against using it on dishes & mugs, and its directions fit the steps above.
Finished the steps? How does it look?
Nice work. Let it dry completely and check it again in good light. Here is what done looks like:
How to tell it's really gone →A faint mark usually needs one more round, not a stronger product.
Heavy buildup usually takes more than one round.
Heavy or long-standing buildup →When to call a professional →How to tell it's working
A soot or greasy mark should look duller after the first wash, and the cloth should come away gray instead of clean. Check the dish once it's dry, under a bright window or lamp, and run a fingertip over the spot to feel for grit or film. A dark outline that survives two more gentle washes has likely set into the glaze, which means the set-in section.
What changes for yours
Adjust for your dishes & mugs
Glass dishware
Glass takes the gentlest approach of all. Use a non-abrasive cleanser, and if scouring is needed, use only a plastic or nylon pad.
Keep metal and other hard objects away from the surface, since they can scratch glass and leave the mark looking worse. Rinse thoroughly and dry it before you put it back in use.
Ceramic dishware
Ceramic can take the same washing steps, but it should not soak or stand in water for long. Wash, rinse and dry it in one go instead of leaving it in a sink of cleaner.
Test the cleaner on the hidden spot first, since the glaze is what you're protecting.
Dishes still hot from the oven
Never add liquid to a hot dish, and don't set it on a countertop, metal surface or in the sink while it's hot. Let it cool before you start, so the warm wash doesn't cause a sudden temperature change.
Glass and ceramicware can't go on a stovetop or under a broiler to loosen a mark. If the black mark is on a pan, skillet or bakeware, see the Pots, Pans & Bakeware guide for that surface.
Mildew on stored dishes
Mildew keeps growing if it's left alone, so brush it off instead of waiting. Do the brushing outdoors and dry, before any water touches the dish.
After brushing, follow the washing steps with mild soap and warm water, then rinse well so no residue is left behind. Dry the dish fully before you put it away.
Soot on dishes
Soot is best removed dry, so brush or vacuum it off before any water or cleaner goes near it. Wetting soot first can spread it, so keep the brushing step first.
Once the dry soot is off, wash with mild soap and warm water, and use the non-abrasive cleanser only if a mark stays.
Heavy or long-standing buildup
An old black mark that has been sitting on a dish for a while is harder to shift than a fresh one, and the steps above may only lighten it. Let the dish dry fully before you judge the result, because a mark can look different once it's dry. If it's still there after one more pass with the non-abrasive cleanser and a plastic or nylon pad, it may not come out completely.
Some marks won't lift at all, because they are damage to the glaze rather than dirt sitting on top of it. Manganese staining from well water can keep coming back until the water itself is treated. In those cases, a repeat of the steps above is the realistic limit.
Don't keep scrubbing a valued dish to chase the last of a mark, since that's where the glaze gets damaged. Accepting a faint mark is a realistic outcome on an everyday dish.
Vinegar, baking soda, peroxide and more
Do home remedies work on black stains on dishes & mugs?
Most home remedies you'll find are meant for fabric, stone or metal, so very few are a good fit for your dishes. Here's where each one stands on glass and ceramic dishes.
Skip6
What makes it worse
Mistakes to avoid
Don't soak ceramic dishes to loosen a mark
Ceramicware should not soak or stand in water for long, so a long soak is the wrong fix. Wash, rinse and dry the dish in one go, then move to the next step if the mark is still there.
Don't use fluorine-based cleaners on dishes
Cleaners with fluorine compounds damage ceramic, glass and stone. Read the ingredient list before you buy any cleaner for a dish, and skip anything that contains them.
Don't reach for bleach before the test
Bleach can darken manganese or iron marks, so a bleach-first approach can turn a faint mark into a dark one. Test on a small, hidden area, and keep bleach as the last step if the mark survives the gentler washes.
Don't wet soot before you brush it off
Water turns dry soot into a gray film that spreads across the glaze and settles into the surface. Brush or vacuum it off dry first, and do the brushing outdoors if the dish has mildew.
Don't skip the extra rinses
Bleach and alkaline cleaners can leave a dull film that looks like the mark is still there. Rinse several times with clean water and check again before you decide the mark has set.
When to call a professional
A dish almost never needs a pro, since the work is a gentle wash and a careful rinse. If a valuable or antique piece keeps its mark after every gentle step, a restorer is the right person to ask rather than reaching for a harsher product. Tell them whether the mark came from soot, mildew or well water, and what you've already tried.
Questions
What causes a black mark on a dish?
Black is a color, so the cause can be mildew, soot, manganese from well water or greasy residue. Some black marks are damage to the surface rather than dirt. Working out which one you have decides how you treat it.
How do I tell soot from mildew?
Look at where the mark sits, how it smells and feels, and how it appeared. Those clues point to the cause, and each one is treated differently. Brush dry soot and mildew before you wet them either way.
Why does the black mark keep coming back?
Manganese from well water is a common reason a mark returns after cleaning, and it keeps coming back until the water is treated. Mildew left in place keeps growing, so brush it off instead of waiting.
Is vinegar safe for black marks on glass dishes?
Vinegar isn't needed for this. Mild soap and warm water come first, then a non-abrasive cleanser if the mark stays. Stick with mild soap and warm water, then the non-abrasive cleanser if the mark stays.
Can I heat a dish to loosen a black mark?
No. Glass and ceramicware can break from sudden temperature change, and they should never go on a stovetop or under a broiler. Wash the dish with warm water instead.
Can a black mark on a dish be permanent?
Yes, some can't be removed completely. Marks that are damage to the glaze or have dried on for a long time may only lighten. Accept a faint mark on an everyday dish rather than scrubbing hard enough to damage it.
Black Stains on other materials
Other stains on dishes & mugs
Start from the bigger picture
How we know this
Every method, amount and warning here comes from university extension services, industry bodies and product makers. We read them, check every step for unsafe combinations and changed amounts, and write it up so you can follow it.