Plastic Tupperware, Rubbermaid, or other containers can become "sticky" feeling if not used regularly. To get rid of the sticky residue, wash the items with Murphy's Oil Soap, and they'll be good as new again. Try it and see for yourself.
I am not so sure it's safe to use a floor and wood cleaning product that contains postassium hydroxide on plastic food containers because plastic is absorbant :-(
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