[dghughes]

I thought the study meant the stuff used at the end after washing. Here in Canada bars and restaurants after washing dishes must rinse dishes in a disinfectant bath and let the dishes air dry. The rinse aid sounds like something in the soap itself that helps the soap not stick to the final clean dishes.

It also seems to be the water used about 4 liters of water in commercial dishwashers vs 12 liters for household types. Commercial use less water, more powerful detergent, no water rinse.