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There are a few special Tupperware products that should be hand-washed. See the Tupperware site for a listing.

According to the manufacturer, Tupperware purchased after 1979 is dishwasher safe on the top rack: although dishwashers have the same temperature water spray on both top and bottom racks, many have drying heater elements located near the bottom.

However, any plastics can deteriorate at a faster rate due to higher temperatures and moisture. The lids and containers should be washed at the same time in the same load, although they may warp and crack after a number of washes.

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