Final answer:
Improper use of cleaning agents in food-contact areas can introduce chemical contaminants to food, including harmful residues that pose health risks. Contaminants can be microorganisms or environmental pollutants, which can lead to foodborne illnesses.
Step-by-step explanation:
The improper use of cleaning agents in food-contact areas can add chemical contaminants to food. Cleaning agents or hard-surface cleaners are designed to remove dirt and kill bacteria. However, if used improperly, they can leave residues that can contaminate food. This can include chemical residues that are not intended to be ingested, thus posing health risks. When it comes to foodborne illnesses, contamination can arise from various sources such as microorganisms like Norovirus and Salmonella, or from environmental sources like pesticides or heavy metals. In the case of a soup container forgotten in the refrigerator that shows contamination, the likely types of contaminants include microorganisms, which can cause foodborne infections and illnesses.