Hereís a kicker.

In my routine practice, I used spent developer as the washing aid after through fixing and quick rinsing. As long as your fixing is complete, thereís nothing more to develop, so you can reuse sulfite-containing mild alkaline solution (that is, used developer) as a washing aid. You probably donít need it to remove residual thiosulfate, but you do get significantly improved removal of sensitizing dyes, and save a lot of water and time.