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This is for the tupperware knowledgeable. I've heated up food in cereal bowl sized tupperware containers with the lids loosened and now the lids are curling up. Nothing I do will flatten them out and they don't stay on securely since they are no longer flat. Any suggestions?
My MIL always says to run them through the dishwasher and then put them back on the base when they are still hot from the dishwasher - and let them cool. They will usually reshape then.
Otherwise see about getting them replaced.
You could try putting them in boiling water for a couple of minutes, taking them out, putting them under a flat plate and weighting the plate with a large can of something. Worth a shot.