Wash Tupperware containers and seals in the dishwasher, unless otherwise noted on product information labels. Load them on the upper rack, away from heating elements that melt and distort their shape. Secure items to prevent hot water from sweeping them about during the washing cycle.
Remove stains from dishwasher-safe items by applying a baking soda paste by hand and rubbing with a non-abrasive sponge or scrubber.
For hand-wash-only Tupperware products, such as those with printing on their surface, use a sponge or dishrag in warm soapy water. Let air dry at room temperature or wipe down with a soft dish towel. Microfiber cloths and towels are also effective cleaning Tupperware without scratching.