Final answer:
The nurse should reference the Material Safety Data Sheet or Safety Data Sheet for the cleaning agent, which contains comprehensive information on the substance's safety and handling.
Step-by-step explanation:
A nurse who is unsure whether a cleaning agent that is in use at the hospital is toxic should prioritize consulting the Material Safety Data Sheet (MSDS) or Safety Data Sheet (SDS) for that specific product. These documents provide vital information about the chemical properties of a substance, health risks, storage protocols, safe handling procedures, and emergency actions in case of an accident. It is important for the nurse to assess this information critically and consider the intended use of the cleaning agent to determine if it is safe for staff and patients. Additionally, the nurse may consult with healthcare facility guidelines, peer-reviewed research, or consult a professional in the field, such as an infection control specialist, to ensure that the cleaning methods being used are appropriate and non-toxic.