It is not illegal for college students to send back dirty clothes. It is normal for college students to send back dirty clothes, which does not belong to the legal category. No parents need to make up lessons for indulging their children in the past and taking care of themselves. The easiest way is to send the dirty clothes back intact and let the children handle them themselves. Let children learn to take care of themselves, learn to stand on their own feet and learn to be independent. This is the greatest responsibility for children.