What is one of the authorized cleaning agents for the M67 Sight Unit?

Denatured alcohol is an authorized cleaning agent for the M67 Sight Unit due to its effectiveness in removing various types of contaminants without leaving residue that could interfere with the optical performance of the sight. Its formulation allows it to evaporate quickly, which minimizes the risk of moisture damage to sensitive components.

Using denatured alcohol for cleaning also ensures that the materials within the sight unit are not harmed, as it is generally safe for use on plastics and glass. This care in selecting appropriate cleaning agents is critical in maintaining the functionality and longevity of the M67 sight, which is essential for accurate targeting and combat effectiveness.

Other substances listed, while potentially effective as cleaning agents in different contexts, may not meet the specific requirements for safety and compatibility with the materials used in the M67 Sight Unit.