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Good Housekeeping Institute reviews analyst Noah Pinsonnault says many modern plastic food-storage containers can go in the dishwasher, but not all. Check the manufacturer’s label, place approved items on the top rack, and skip heated drying; hand-wash older containers without care instructions.
Many modern plastic food-storage containers are dishwasher-safe, but consumers should check each item’s label or manufacturer instructions before washing it, Good Housekeeping Institute reviews analyst Noah Pinsonnault says. His advice also addresses where to place approved containers and how to limit heat exposure, which can warp some plastics and lids.
Pinsonnault advises looking for a dishwasher-safe symbol or label, usually on the bottom of a container, or consulting the maker’s care instructions. He cautions that the recycling number printed on plastic is not a guide to whether it can go in a dishwasher. Dishwasher-safe and microwave-safe labels are also separate: approval for one use does not establish approval for the other.
For containers identified as dishwasher-safe, the report recommends putting them on the top rack, farther from the heating element. Pinsonnault says the lower rack can expose plastic to more intense heat and raise the risk of warping or distortion. The report also advises skipping the dishwasher’s heated-dry setting, particularly for lightweight containers and lids, because high heat can contribute to warping over time even for some dishwasher-safe plastics.
Cleaning the container itself is not the only consideration. Food residue can collect around lid seals and gaskets, so those areas need attention during washing. For older containers that lack a label or care guidance, Pinsonnault recommends hand-washing them; age can make plastic more brittle or deteriorated, and without manufacturer guidance it is difficult to know how it will hold up in a dishwasher.
Heat Can Distort Plastic Containers
The advice matters because a container that is technically dishwasher-safe can still be vulnerable to the conditions inside a particular wash cycle. Rack position and drying heat affect how much heat plastic receives, and distortion may make a container or lid harder to use. Checking the care label before washing helps avoid relying on assumptions about all plastic items.
It also clarifies a common source of confusion: a recycling code identifies a type of plastic for recycling purposes, but Pinsonnault says it does not establish dishwasher safety. Separate labels matter for dishwasher and microwave use. Following the care guidance for each appliance can help people avoid damaging containers while cleaning them.
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Labels Guide Dishwasher Use
The Good Housekeeping report focuses on practical care for reusable food-storage containers, including the Tupperware brand named in its headline. Its guidance is not a blanket approval for every Tupperware product or every plastic container: Pinsonnault says many, but not all, modern food-storage containers are dishwasher-safe.
The source offers a separate approach for lingering food odors. It recommends washing the container thoroughly and leaving it to air out with the lid off. If the smell remains, a baking soda and water solution may help absorb odors. The report does not provide a specific mixture or soak time, so it should not be treated as a manufacturer-specific cleaning instruction.
Each Container Has Its Own Limits
The report does not identify particular Tupperware models or give a list of products that are approved for dishwasher use. It also does not specify a universal temperature threshold or say that every item marked dishwasher-safe will resist damage under every cycle. Product-specific care instructions remain the deciding guidance, and the source does not provide separate instructions for every model, age or plastic type.
For containers with missing labels, the report does not offer a reliable way to determine dishwasher safety from the recycling number or appearance. Pinsonnault’s stated precaution is to wash older, unlabeled containers by hand. The source also does not quantify how much heated drying contributes to warping or how quickly damage may occur.
Check Care Labels Before Washing
Before loading a plastic container, check its bottom for a dishwasher-safe label or consult the manufacturer’s care instructions. If it is approved, follow the report’s practical steps: use the top rack, skip heated drying and clean residue from seals and gaskets. Keep microwave suitability separate from dishwasher suitability, since the labels address different uses.
If the container is old and has no instructions, hand-wash it rather than guessing. For lingering odors, wash it thoroughly and leave it open to air; the report says a baking soda and water solution may help if the smell persists. No further product-specific guidance or follow-up development is included in the source material.
Key Questions
Can you put Tupperware in the dishwasher?
Many modern plastic food-storage containers can go in the dishwasher, but not all. Check the individual container’s label or the manufacturer’s care instructions before washing it.
Does the recycling number mean a container is dishwasher-safe?
No. Pinsonnault says the recycling number does not indicate dishwasher safety. Look for a dishwasher-safe label or consult the manufacturer’s instructions.
Where should dishwasher-safe plastic containers go?
The report recommends the top rack, where plastic is farther from the heating element and less exposed to the stronger heat that may occur on the lower rack.
Should I use heated drying on plastic containers?
The report advises skipping heated drying, especially for lightweight containers and lids, because high heat can contribute to warping over time.
How should I wash an older container with no label?
Pinsonnault recommends hand-washing older, unlabeled containers. Plastic can become brittle or deteriorate with age, and the source says it is difficult to predict how an older item will handle a dishwasher without manufacturer guidance.
Source: goodhousekeeping.com
