Abstract: An ultrasonic cleaner for instruments is provided with at least one tank suitable for holding the medical instruments and a cleaning solution therein. A source of ultrasonic waves, such as ultrasonic transducers, is mounted on the exterior of the tank and is connected to a source of electrical power. The cleaning tank has a bottom plate with a drain opening connectable to a municipal sewage line, allowing to drain the cleaning solution along with impurities discharged after the cleaning cycle has been completed. In an alternative embodiment, the cleaning solvents are recycled via a Y-type connector into a second high-pressure hose and then into a storage receptacle with a cover. The alternative embodiment is designed for industrial applications only, where contamination does not pose a risk.