Which of the following items must be cleaned and disinfected after each client?

The correct answer is that metal tweezers and comedone-extractors must be cleaned and disinfected after each client. This is because these tools are reusable and can come into direct contact with blood or bodily fluids, which makes them a potential source of infection if not properly sanitized. Effective cleaning and disinfection of such tools help in preventing cross-contamination between clients, thereby ensuring a safe and hygienic environment in the salon.

Single-use items should not be cleaned and disinfected since they are meant to be used once and then disposed of. Furniture in the salon does not require the same level of disinfection as tools that come in direct contact with clients. Disposable gloves are also used once and thrown away after a single client, so they do not need to be disinfected, as they are not reused. Understanding the distinction between reusable and disposable items is crucial to maintaining hygiene standards in esthetics practices.