From their results section:

> "Interestingly, detergent residue from professional dishwashers demonstrated the remnant of a significant amount of cytotoxic and epithelial barrier–damaging rinse aid remaining on washed and ready-to-use dishware."

They found nothing wrong with washing with detergent, just using rinse aid to dry in a commercial setting due to the detergent residue the rinse aid could leave.

> A professional dishwasher completes 1 or 2 wash and rinse cycles using 3.5 L of water per cycle. The detergent and rinse aid are automatically dispensed into the water at a concentration of 1.5 to 4 mL/L and 0.1 to 0.5 mL/L, respectively. At these concentrations, the residual dilution factor after rinse ranges from 1:250 to 1:667 for detergents and 1:2,000 to 1:10,000 for rinse aids.

> Household dishwasher detergents in a normal cup and plate washing program typically consume a total of 12 L of water: 4.8 L during the washing cycle, 3.6 L of water for the intermediate rinse cycle, and 3.6 L of water for the final rinse cycle. Between the washing and rinsing cycles, 200 mL of water remains inside the dishwasher. Accordingly, the dilution factor for one 20-g tablet of detergent is 1:80,000 (w/v).