A food contact surface needs to be cleaned:

A food contact surface requires routine cleaning to ensure food safety, and the correct answer reflects the necessity of maintaining sanitary conditions. Cleaning such surfaces before starting a new task is crucial to prevent cross-contamination between different food types, especially when switching from raw to cooked food. Additionally, cleaning every four hours during regular use helps manage bacterial growth and contamination during long periods of activity, ensuring the surface remains safe for food contact. Lastly, cleaning after each use is fundamental to remove any residues that could harbor pathogens, supporting a hygienic food preparation environment. Therefore, the comprehensive approach encompassed in the correct answer emphasizes that all the listed practices are vital for maintaining the integrity of food safety standards in food service operations.