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I had the same problem as another reviewer with discoloration from stuff like spaghetti-o's. It sounds a little strange, but try spraying a little PAM on a paper towel and rubbing it on the 'rubbery' surfaces - worked for me with my daughter's thermoses like this. I've also found that washing on the top rack of the dishwasher gets the stains (and the gross greasy residue from condensed chicken noodle soup) out very well. To keep things hotter longer, fill the thermos with the hottest tap water you can, put the lid on and leave it sit awhile, then dump out the water and fill with the hot food. It'll still be quite warm at lunch time. Hope that helps. :)