Ilford recommends that if a non-hardening fixer is used, a 5-10-20 inversion method of washing will leave the film clean. After fixing, fill the tank with clear water the same temp as the process, and invert the tank 5 times. Drain and refill, inverting 10 times, then draining. Finally, fill the tank once again, inverting 20 times, then draining. At this point the film is ready to either be soaked in photo flo(or whatever brand) of rinse aid then hung to dry. For those who prefer to conserve water, this is a wonderful method, I recommend it.