Which step is NOT a part of proper ultrasonic cleaning?

Filling the tank to overflow is not a recommended practice in proper ultrasonic cleaning because it can dilute the cleaning solution and result in ineffective cleaning. Ultrasonic cleaners are designed to operate with a specific amount of liquid, which allows the ultrasonic waves to create cavitation bubbles effectively. When the tank is filled beyond the designated level, it can disrupt the cavitation process and reduce the cleaner's efficacy.

In contrast, drying instruments prior to sterilization is critical to ensure that no moisture remains, as water can interfere with the sterilization process. Using a detergent with a rust inhibitor is important to prevent corrosion and maintain the integrity of the instruments during cleaning. Rinsing instruments thoroughly is also crucial to remove any residual cleaning agents or debris before sterilization. Thus, filling the tank to overflow does not align with proper ultrasonic cleaning protocols.