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The correct answer is that all types of contaminants—chemical, biological, and nuclear substances—may need to be cleaned during the decommission process. Decommissioning typically occurs after a facility or project has reached the end of its operational life, and ensuring safety during this process is paramount. Surfaces that have been contaminated can pose health risks to workers and the environment if not properly addressed.

Cleaning surfaces contaminated with chemical substances is essential as they can cause toxic reactions or hazards if they come into contact with individuals or the surrounding environment. Biological substances, particularly hazardous pathogens or biohazards, also necessitate thorough decontamination to prevent infection or the spread of disease. Similarly, nuclear substances can leave behind radioactive contamination, which requires specialized cleaning methods to ensure that radiation levels are reduced to safe limits for those who enter the area afterward.

Therefore, to maintain comprehensive safety and compliance with regulatory standards, it is vital to address the cleaning of surfaces that may have been contaminated with any of these categories of substances during the decommissioning process.