A washing system for dispensing a liquid cleanser includes a dispenser having a positive displacement pump and a collapsible bag containing the liquid cleanser. The dispenser includes an inlet and an outlet to the positive displacement pump. The collapsible container includes an outlet. A container support means supports the collapsible container. A flexible supply line connects the collapsible container to the pump. The flexible supply line also has a first end connected to the outlet of the collapsible container and a second end connected to the inlet to the pump. A one way valve in the flexible supply line blocks fluid flow to the collapsible container while permitting fluid flow from the collapsible container to the dispenser.