Which item would need to be cleaned after each use according to disinfecting procedures?

The correct choice is a reusable metal tool, which must be cleaned and disinfected after each use to maintain hygiene and safety standards. These tools can harbor bacteria and other pathogens if not properly cleaned, as they are used repeatedly on different clients. Disinfecting these tools helps to prevent the spread of infections and ensures that they are safe for subsequent use.

In contrast, a disposable sponge and a single-use towel are designed for one-time use, making cleaning unnecessary since they are discarded after use. A plastic container may be reused, but it typically can be washed without the need for disinfection between uses, depending on its function in a beauty treatment. Therefore, the reusable metal tool is the clear item that requires thorough cleaning according to disinfecting procedures, as it directly relates to client safety and infection control.