Alternatives for Green Cleaning in Exterior-Car Washing Purpose

This is a new one for me. A building is hosting a car washing event for charity during their performance period (recent news to the LEED team). In order to keep with their Building Exterior and Hardscape Management Plan, they would have to select a car washing product that would be Eco Label or Green Seal and find it fast (the event is tomorrow). We can't seem to find a solution, but have seen plenty of Green Car Washing products out there. Has anyone have experience with anything like this? Anyone can recommend a product (they are in California) that may be readily available that is Green Seal or Eco Logo? Or would it be ok to use one of the Green Products out there. One such example is Green Scene Car Wash Products: http://www.simonizusa.com/business/Content/NEW_Green_Scene_Car_Wash_Products.asp Any quick thouhts on the matter would be appreciated, as they'd hate to have to cancel the event. Thanks!