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Food containers are designed for food storage. Therefore, it is not at all surprising that the container is constantly contaminated from the inside.
Details
Usually, the problem is easily solved by wiping the plastic material with a sponge soaked in dishwashing liquid.
Most often, foam copes with stains. After that, it remains only to rinse the container with water.
However, sometimes dirt is so difficult to remove that gels and powders intended for cleaning do not help.
This often happens if there were dishes with sauces or other liquid components in the containers.
Of course, you can't put a new portion of food into an uncleaned container. First, you need to find a means that will still remove the contamination.
Recourse
Ordinary baking soda will come to the rescue. It is necessary to pour soda into a deep container, pour a small amount of water and mix with a spoon.
A paste-like mass will be obtained, which must be applied to the dirty container.
The surface of the container should be thoroughly wiped with the prepared product.
It is not necessary to wash off the remains of soda immediately. The tool should be on the plastic surface for at least 2-3 hours.
And only after that, you can pour water over the container. There should not be a single speck left on the container. After such cleaning, you can put food in the lunch box again.