Which item is necessary for proper sanitation practices in a barbershop?

To maintain proper sanitation practices in a barbershop, having a disinfectant solution is essential. Disinfectants are specifically formulated to kill bacteria, viruses, and fungi on surfaces and tools, which helps prevent infections and maintains a safe environment for both clients and barbers. Implementing effective sanitation practices, including using a disinfectant solution, ensures that all equipment, such as scissors, clippers, and combs, are free from pathogens after each use.

The other items listed do not contribute to sanitation in the same way. Perm solution and hair gel are products used for styling and chemical treatments, but they do not serve any purpose in sanitation. Haircutting capes are important for keeping clients clean and comfortable during a haircut, but they need to be laundered and not treated as disinfecting agents themselves. Thus, a disinfectant solution is the only item directly tied to effective sanitation practices in a barbershop setting.