Final answer:
The nurse should clear the tubing before and after each use during suctioning to prevent cross-contamination and maintain cleanliness.
Step-by-step explanation:
The nurse should clear the tubing before and after each use during suctioning. This is important to prevent cross-contamination and ensure the equipment remains clean and safe for use. By clearing the tubing before and after each use, the nurse can remove any mucus or secretions that may be present, reducing the risk of infection or blockage.