I used to be a Tupperware consultant...you'd be amazed at how many people ask the same question, and usually it's their husband/partner that's left their lunch/drink in the car The other gals are right - baking soda is great, or get some wet newspaper or paper towel, use it to wipe out the container and then seal the paper/towel in the container and put it in the freezer overnight. If it's really bad it might need more than one go, but it should work!