Which of the following should never be used to clean a surgical instrument?

In the context of cleaning surgical instruments, it is essential to understand the properties and appropriate uses of various cleaning agents. Surgical instruments require specific cleaning protocols to ensure proper sterilization and to prevent damage.

Sodium hypochlorite, while a potent disinfectant, can cause corrosion and deterioration of metal instruments. Its high corrosive nature makes it unsuitable for cleaning delicate or valuable surgical tools, as it can lead to rust and degradation.

Glutaraldehyde is primarily used for high-level disinfection rather than cleaning. While it is effective for sterilizing heat-sensitive instruments, it does not serve as a suitable cleaning agent for all types of surgical instruments because it can leave a residue and is toxic, which can pose risks if not handled properly.

Saline, on the other hand, is primarily used to hydrate tissues and is not an effective cleaning agent for surgical instruments. Its use can lead to the improper cleaning of instruments since it does not eliminate contaminants, such as blood, protein residues, or other surgical debris.

Therefore, the comprehensive approach to maintaining surgical instruments emphasizes avoiding these substances in the cleaning process, leading to the conclusion that none of the listed options should be utilized to clean surgical instruments.