We have recently restarted washing pipettes at our facility after 4 years of sending them off to one of our offsite labs. We have a procedure in place, but have had a hard time finding(remembering) what to use as an indicator to determine the detergent has been rinsed completely away. Does anybody have a suggestion and for a product/manufacturer. We would ask the person who was doing it for us prior, but she has left under bad circumstances.