Abstract: A cleaning apparatus for use in the interior of tank cars includes a dome plate assembly, and a base plate assembly disposed within an open manway of a tank car. A vertically extending main solution pipe assembly extends through the dome plate assembly and its lower end terminates with and is in flow communication with a base plate assembly in the tank car. A pair of base plate solution arms are provided on opposite sides of the main solution pipe assembly and are in flow communication therewith. Support chains attached along the main solution pipe assembly are provided to support the base plate solution arms in a horizontal position. These base plate solution arms are generally pivotally attached to extension solution arms which extend outwardly therefrom and each solution arm terminate with a rotatable nozzle assembly.