Abstract: An ultrasonic cleaning apparatus (10) and method for use with a cleaning solution for cleaning soiled items, such as automobile parts. The cleaning apparatus includes a cleaning tank (11) for containing a quantity of the cleaning solution therein, with the cleaning tank having a bottom and a top. An ultrasonic generator (17, 18, 122) is provided for ultrasonically exciting the cleaning solution contained within the tank. The tank includes an upper drain (32, 33 or weir 200) and a lower drain (21). A coalescing filter (14) is used for filtering the cleaning solution. A sump tank (12) provides an extra quantity of the cleaning solution for at times overfilling the tank to draw off light ends of oils and greases from the top of the tank. At other times, the lower drain is used to draw off heavy ends of greases and oils from the bottom of the tank.