Apparatus (10) for washing tableware (14) has a container (11) adapted to hold a liquid. An ultrasonic generation device (32) is mounted on the container (11) so as to emit ultrasonic energy into the container (11). The container is adapted to have tableware (14) placed inside the container (11). The ultrasonic energy generation device (32) emits ultrasonic energy in the frequency range from substantially 20kHz to 80kHz.
