Which of the following cannot be used to sanitize effectively?

Detergents are primarily used for cleaning and removing dirt, grease, and food residues from surfaces, but they do not have the necessary properties to effectively kill microorganisms. Sanitizers need to be specifically formulated to reduce the number of pathogens to safe levels on food contact surfaces, while detergents focus on the cleaning aspect without necessarily providing disinfection or sanitization.

On the other hand, quaternary ammonium compounds, iodine, and chlorine are all recognized sanitizers. Quaternary ammonium compounds, often referred to as "quats," have antimicrobial properties and are commonly used in food service environments for sanitizing surfaces. Iodine solutions are also effective in killing bacteria and viruses at appropriate concentrations and conditions. Chlorine-based sanitizers are well-known for their strong disinfectant qualities and are widely used in various sanitation applications. Therefore, options B, C, and D are all effective sanitizers, distinguishing the detergent in option A as the one that cannot be used to effectively sanitize.