What is a purpose of laboratory cleaners and solvents?

• A. Disinfect surfaces
• B. Remove tears
• C. Debris that is difficult to remove
• D. Polish lenses

Answer: (C)

The main idea is that laboratory cleaners and solvents are used to dissolve or loosen stubborn contaminants that don’t come off with water or simple rinsing. In lens work, residues like oils, proteins, adhesives, or other films can cling to surfaces, and a cleaner or solvent helps break those bonds so the debris can be removed more effectively. This is why removing debris that is difficult to remove is the best description of their purpose.

Disinfection is a separate process and isn’t the primary function of cleaners/solvents in this context. Removing tears isn’t a relevant task for laboratory cleaners, and polishing is a finishing step that comes after cleaning, not the main job of these chemicals.