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From: food52.com / How to Get Smells and Stains Out of Tupperware"Remove stains (and odors) with baking soda. Baking soda’s cleansing properties are nothing new, and work as a great stain and odor remover for Tupperware, as well. Simply make a thick-ish paste of warm water and baking soda and rub it into the inside the container. Let it sit for at least one day, then rinse it out thoroughly. Continue until no stains remain and the container smells fresh. "