When phosphate free dishwashing detergents are used in a dishwasher where the water is hard, a white deposit is often left on the dishes. Is the deposit left during the wash cycle or the rinse cycle?
Logic would say that it must be left during the wash cycle since no detergent (with or without phosphate) would be present in the rinse cycle. The rinse cycle behavior wouldn't be better or worse if the detergent did have phosphates. Howver, logic is poor tool for analyzing reality. In which cycle is the white deposit actually left?