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Many modern plastic food-storage containers can go in the dishwasher, but safety depends on the manufacturer’s label or care instructions—not the recycling number. Good Housekeeping Institute analyst Noah Pinsonnault recommends placing approved plastics on the top rack, skipping heated dry, and hand-washing older containers without care guidance.
Many modern plastic food-storage containers can be washed in a dishwasher, but not every container is approved for it, according to Noah Pinsonnault, a reviews analyst at the Good Housekeeping Institute’s Home Care & Cleaning Lab. He advises checking the container’s care label or the manufacturer’s instructions, then using the top rack and avoiding heated dry to help limit heat-related warping.
A dishwasher-safe symbol or label is typically printed on the bottom of a container. If no label is present, the manufacturer’s care instructions are the more reliable guide. Pinsonnault cautions that a container’s recycling number does not establish dishwasher safety; that number is not a substitute for specific care directions.
Dishwasher-safe and microwave-safe are also separate designations. A label for one use does not automatically confirm that the container is suitable for the other, so consumers should look for the relevant marking or instruction for each appliance. The guidance does not identify a single rule that applies to every plastic product.
For containers marked dishwasher-safe, Pinsonnault recommends putting them on the top rack, where they are farther from the dishwasher’s heating element. He also advises skipping the heated-dry setting, particularly for lightweight containers and lids. Food residue can collect around lid seals and gaskets, so those areas need careful cleaning as well.
Can Tupperware Go in the Dishwasher? Check Before You Wash
Some plastic food containers are dishwasher-safe, but the label or manufacturer’s care instructions decide. Recycling numbers do not.
Check the care guidance
Follow instructions for the specific container; microwave-safe and dishwasher-safe are separate labels.
Check the container’s label or the manufacturer’s care instructions.
For approved plastics, choose the top rack and skip heated dry when possible.
Food residue can collect around lid seals and gaskets.
When instructions are missing
Age and wear can make a container’s response to dishwasher heat harder to predict.
- Recycling codes do not show dishwasher safety.
- Older plastic may become brittle or deteriorate.
- Hand-wash older containers without care guidance.
- Top-rack placement and no heated dry reduce risk, but do not remove it.
For lingering odors
Odor care is separate from deciding whether a container can go in the dishwasher.
Clean it thoroughly
Then leave the container uncovered, with the lid off, to air out.
Baking soda and water
A solution may help absorb odors that remain.
How to Avoid Warped Containers
The advice matters because a container marked dishwasher-safe can still be exposed to conditions that may damage it. According to Pinsonnault, the lower rack can subject plastic to more intense heat, which can cause warping or distortion. Heated drying can also contribute to warping over time, including for some plastics labeled dishwasher-safe.
That can leave containers or lids misshapen and less practical to use. Checking the label before washing and choosing gentler placement and drying settings are straightforward ways to lower that risk. The recommendations are precautions, not a promise that every labeled container will remain unchanged through repeated dishwasher cycles.
Cleaning also involves more than the main surfaces: food trapped around a lid’s seal can remain after a wash if those areas are overlooked. Paying attention to gaskets helps address residue where it can collect.
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Labels Matter More Than Recycling Codes
Plastic storage products vary, and the guidance is to follow the directions for the specific item rather than infer its care needs from a general material marker. Pinsonnault says recycling codes do not indicate dishwasher safety. They should not be used to decide whether a container can withstand a dishwasher’s heat.
Age is another reason to be cautious. Plastic can become more brittle or deteriorate over time, and an older container without care information may not hold up as expected. Pinsonnault recommends hand-washing older, unlabelled containers because their response to dishwasher conditions is difficult to predict without manufacturer guidance.
Odors are a separate issue from dishwasher suitability. For a lingering smell, the suggested approach is to wash the container thoroughly and let it air out with the lid off. A baking soda and water solution may help absorb persistent odors, according to the guidance.
What Container Labels Cannot Tell You
The guidance does not name specific Tupperware models or establish that every container from a particular brand is dishwasher-safe. Product instructions remain decisive, and the material provided does not specify how many wash cycles a container can tolerate or quantify the risk of warping.
It is also unclear how a particular unlabelled container will respond to a dishwasher, especially if it is older or shows signs of wear. For those items, the recommendation is to wash by hand rather than guess from a recycling number or appearance. The advice does not claim that top-rack placement or turning off heated dry eliminates all risk.
Check Care Instructions Before Washing
Before putting a plastic food container in the dishwasher, look for a dishwasher-safe marking or consult the manufacturer’s care instructions. If it is approved, place it on the top rack, skip heated dry when possible, and clean around the lid’s seals. Keep microwave suitability as a separate check.
If the container has no care label—particularly if it is older—hand-wash it. For lingering odors, wash it thoroughly and leave it uncovered to air out; a baking soda and water solution may help. The next step for consumers is to follow the directions for each individual container, since no universal rule is given for all plastics.
Source: rss
Key Questions
Can you put Tupperware in the dishwasher?
Some plastic food containers are dishwasher-safe, but not all. Check the item’s label or manufacturer care instructions before washing it.
Does the recycling number show whether a container is dishwasher-safe?
No. Pinsonnault says a recycling number does not indicate dishwasher safety. Look for a care label or consult the manufacturer instead.
Where should dishwasher-safe plastic containers go?
Pinsonnault recommends the top rack, which keeps plastic farther from the heating element. He also advises skipping heated dry, especially for lightweight containers and lids.
What should I do with an older container that has no label?
Hand-wash it. Plastic can become more brittle or deteriorate with age, and without manufacturer instructions its dishwasher tolerance is hard to determine.
How can I get lingering odors out of a food container?
Wash it thoroughly and let it air out with the lid off. A baking soda and water solution may help absorb odors that remain.
Source: goodhousekeeping.com
