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Using separate applicators for each client is the best practice for preventing cross-contamination in the salon. This approach minimizes the risk of transferring bacteria, viruses, or other pathogens between clients, ensuring that each individual receives services with clean and uncontaminated tools. By utilizing separate applicators, it safeguards both the clients' health and the integrity of the salon's hygiene practices.

In the context of client safety and effective infection control, this method is far superior to others mentioned. For example, using the same tools for each client increases the likelihood of transmitting infections, while washing hands between clients is a necessary practice but does not address the contamination of tools and applicators directly. Lastly, sanitizing tools only once a day may leave a gap in between clients where contamination could occur, whereas using dedicated applicators for each client provides immediate protection and reinforces the commitment to high hygiene standards.