The raw materials of plastic lunch boxes cause minerals and additives added in the lunch boxes to dissolve with water, vinegar and oil contained in food, so it is easy to produce odor. Introduce several simple methods to get rid of the smell in the lunch box: 1. Milk deodorization method: After using the plastic lunch box, clean it with detergent, then pour two soup keys of fresh milk into the lunch box, cover it, shake it, and make every corner of the lunch box contact with the milk for about one minute. Finally, pour out the milk and clean the lunch box. 2, orange peel deodorization method: after using the plastic lunch box, first clean it with detergent, then put the fresh orange peel in the lunch box, cover it, and leave it for about 3 to 4 hours. It is difficult to get rid of the smell of vegetables in the lunch box. Wipe the lunch box with bread dipped in vinegar and let it dry for one night, and the smell will disappear. To remove the odor in the lunch box, you can wipe it with vinegar to neutralize the odor. If you have enough time, you can put 1 cups of vinegar in the lunch box, cover it and leave it overnight. The vinegar will absorb the smell of the lunch box. Or sprinkle some baking soda powder and let it stand overnight, which also has the effect of eliminating odor. Try it. You can also put lemon in the lunch box and try orange peel/grapefruit peel.