Washing mold off dishes removes it, but not safely
Yes, you can wash mold off dishes with soap and water, and the mold will come off. The problem is that washing alone does not kill the mold spores — it just moves them around. Mold that looks clean may still have living spores embedded in cracks, glazing, or the porous material of ceramic and wood. A standard dishwasher cycle does the same thing: it removes visible mold but does not reliably kill spores that can regrow.
If you have moldy dishes, the safest approach depends on what the dishes are made of and how much mold is present. Non-porous items like glass and smooth ceramic can be sanitized. Porous items like unglazed pottery, wood, and bamboo cannot be fully disinfected once mold takes hold, and the health risk is higher.
The real question is not whether you can clean them, but whether you should keep them at all.
Key Takeaways
- Washing mold off dishes removes the visible growth but does not kill spores, which can regrow in damp conditions.
- Non-porous dishes like glass and glazed ceramic can be sanitized with heat or bleach, but porous dishes like wood and unglazed pottery cannot be fully disinfected.
- A dishwasher's hot cycle (140°F or higher) can kill mold spores if the water reaches that temperature throughout the load, but many home dishwashers do not get hot enough.
- If mold has been on dishes for more than a few days or covers a large area, replacing them is safer than trying to sanitize them.
How heat kills mold spores on dishes
Mold spores die at sustained temperatures above 140°F (60°C). A commercial dishwasher reaches this temperature reliably and holds it long enough to kill spores. Most home dishwashers have a "sanitize" cycle that claims to reach 140°F, but many do not actually get that hot throughout the entire load, especially if dishes are stacked tightly or the heating element is weak.
If you want to use heat to disinfect moldy dishes at home, boiling water is more reliable than a dishwasher. Submerge the dishes in boiling water for at least one minute. This works for glass, ceramic, and metal. Do not use this method on plastic, wood, or items with glued handles, as the heat can damage them.
After boiling or a sanitize cycle, dry the dishes when ready with a clean cloth. Leaving them wet defeats the purpose — mold grows in moisture.
Bleach and other chemical disinfectants
A solution of one part bleach to nine parts water kills mold spores on non-porous dishes. Soak the dishes for 10 minutes, then rinse thoroughly under running water. Bleach works on glass, ceramic, and metal, but it can damage or discolor some glazes and will corrode metal over time.
Vinegar is often recommended for mold, but it is not strong enough to kill spores reliably. It may remove surface mold and reduce the smell, but spores can survive and regrow. If you prefer to avoid bleach, a commercial mold-killing spray rated for food contact surfaces is a safer alternative than vinegar.
Never mix bleach with other cleaners, especially ammonia or vinegar. The chemical reaction produces toxic gas.
Why porous dishes cannot be fully sanitized
Wood, bamboo, unglazed pottery, and cork are porous — they have tiny holes and cracks that water and mold spores can penetrate. Once mold grows into these materials, the spores are protected inside the material where heat and bleach cannot reach them. Washing, boiling, or soaking may remove the visible mold, but spores remain alive deep in the material.
Porous dishes that have had mold for more than a few days should be discarded. The health risk is not worth the cost of a dish or bowl. If the mold is very fresh and covers only a small spot, you can try boiling the item and drying it when ready, but understand that you are not fully eliminating the spores.
Glazed ceramic is different — the glaze seals the surface and prevents spores from penetrating. Glazed dishes can be sanitized with heat or bleach.
When to throw dishes away instead of cleaning them
Discard moldy dishes if any of these are true: the mold has been visible for more than three to five days, the mold covers more than a small spot, the dishes are made of wood or unglazed material, or you are unsure whether the glaze is intact. Mold that has had time to establish itself produces more spores and is harder to kill completely.
If someone in your household has a weakened immune system, is pregnant, or has a mold allergy, err on the side of throwing the dishes away. The cost of replacement is lower than the risk of illness from spores that survive cleaning.
Dishes are cheap. Your health is not.
How to prevent mold on dishes in the first place
Mold grows on dishes that stay wet or damp for hours. Dry dishes when ready after washing, or run them through a heat-dry cycle in the dishwasher. Do not leave dishes in standing water in the sink. If you hand-wash, dry them right away with a clean cloth.
Store dishes in a dry cabinet, not in a damp cupboard or under the sink where humidity is high. If your kitchen has high humidity, use a dehumidifier or improve ventilation by running the exhaust fan while cooking and for 20 minutes after.
If dishes have been sitting unwashed for days, soak them in hot water with a little dish soap, then wash and dry them when ready. Do not let them sit wet overnight.
What to do if mold is in your dishwasher, not just on dishes
If you notice mold growing inside the dishwasher itself — on the rubber seals, the spray arms, or the bottom — the problem is not the dishes. The dishwasher is not draining properly or is not getting hot enough to kill spores between cycles. Run an empty cycle with two cups of white vinegar in the bottom to clean the interior, then run another empty cycle with the heat-dry setting on.
If mold returns quickly, check that the drain hose is not kinked and that water is draining fully after each cycle. A clogged filter or drain can trap water and create a mold-friendly environment. Clean the filter and drain regularly.
If the dishwasher continues to grow mold, the seal or internal parts may be damaged and the machine may need repair or replacement.
Frequently Asked Questions
Is it safe to eat off a dish I washed with soap and water after it had mold?
Washing with soap and water removes visible mold but does not kill spores. If the dish is non-porous (glass or glazed ceramic) and the mold was light and fresh, the risk is low. If the dish is porous or the mold was heavy or old, spores can regrow and pose a health risk, especially for people with weak immune systems or mold allergies.
Can I use a dishwasher to sanitize moldy dishes?
Only if your dishwasher has a sanitize cycle and reaches at least 140°F throughout the load. Many home dishwashers do not get hot enough. If you are unsure, boiling water is more reliable — submerge the dishes for one minute and dry when ready.
Will vinegar kill mold spores on dishes?
Vinegar removes surface mold and reduces smell, but it does not reliably kill spores. Bleach (one part bleach to nine parts water, 10-minute soak) or heat (boiling or a true sanitize cycle) are more effective.
What if mold is growing on dishes still in the cabinet?
Remove the dishes and dry the cabinet thoroughly. Mold in the cabinet means humidity is too high. Improve ventilation, use a dehumidifier, or move dishes to a drier location. Wash the moldy dishes with heat or bleach before storing them again.