Which of the following is a common indication for using an autoclave?

An autoclave is a crucial piece of equipment used primarily in medical and esthetic settings for the sterilization of instruments. The process involves using high-pressure steam at elevated temperatures to eliminate all forms of microbial life, including bacteria, viruses, and spores. This makes it especially important for sterilizing surgical instruments, ensuring they are safe for use and free from contaminants that could lead to infection.

The other options, while relevant to various practices in esthetics and healthcare, do not align with the primary function of an autoclave. Storing linens does not require sterilization, as linens are typically sanitized through washing. Cleaning skin products involves different protocols and techniques, often including disinfection rather than sterilization. Lastly, cooling heated tools can be handled through other methods that do not involve an autoclave. Therefore, the use of an autoclave is specifically indicated for the sterilization of instruments to maintain hygiene and prevent infection during procedures.