Which of these is NOT an example of a decontamination cleaning solution?

The correct answer is based on understanding the purpose and characteristics of decontamination cleaning solutions. Decontamination typically involves using substances that can effectively neutralize or remove contaminants.

Commercial detergents are often used for general cleaning and may assist in removing surface dirt and organic material; however, they do not specifically target the types of contaminants that would be present in a decontamination process, particularly in a water well monitoring context. Detergents primarily work through surfactant properties rather than chemical reactions that would neutralize hazardous substances.

In contrast, methanol and hydrochloric acid are both solvents that can effectively break down or neutralize a range of contaminants, while distilled water is often used as a rinse or diluent in decontamination protocols. Thus, the other options present substances that have recognized functionality in decontamination processes, whereas commercial detergent, while useful for general cleaning, does not fall into the same category for the specific purpose of decontamination in contexts like water well monitoring.