What should a barber avoid doing when shampooing prior to a chemical service?

When shampooing prior to a chemical service, it is crucial for a barber to avoid irritating the scalp. This is because a chemical service involves applying products that can be strong and potentially damaging to sensitive skin. If the scalp is already irritated from vigorous scrubbing or using harsh products, it may lead to discomfort or a negative reaction to the chemical service.

Chemical treatments can exacerbate existing irritation, leading to issues such as inflammation or allergic reactions. Therefore, the focus should be on gentle, careful handling of the scalp to ensure that it is in the best possible condition for the forthcoming treatment. Maintaining a calm and soothing approach during the shampooing process helps in preparing the hair and scalp adequately for chemical applications.

While the other choices may have their place, they do not directly address the importance of protecting the scalp from irritation, which is critical when performing a chemical service.