Certain foods, such as tomato-heavy dishes or curries containing turmeric, can stain plastic food storage containers. Try spraying a little cooking spray into the container before adding items that might stain. Or, simply use glass containers for the offending foods.Our expert, Jessica, says: "Foods seasoned with turmeric and other brightly colored ingredients (like beets, for example) may stain many plastic containers when reheated in them. It may be better to reheat those foods in glass containers."