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The primary role of quaternary ammonium compounds, known as quats, in salon sanitation is to act as a chemical disinfectant. These compounds are effective against a wide variety of pathogens, including bacteria, viruses, and fungi, making them essential in maintaining a hygienic environment in salons. Quats are often used on surfaces and tools to prevent the spread of infections and ensure safe practices for both clients and stylists.

In the context of salon sanitation, quats are preferred because they are generally non-corrosive and can be used on various surfaces without damaging equipment. Their use helps meet health regulations and standards required for safe operating environments in beauty establishments.

Other options, such as adding fragrance, softening hair, or cleaning mirrors, do not relate to the fundamental purpose of quats in a sanitation context. While they may have their own roles in the salon, they do not pertain to the disinfecting properties that quats provide.