I did a workshop many years ago with George Krause, the master of chemically torturing both negatives and prints.
George's approach bleaching prints was to mix a small batch of bleach when and as needed from potassicum ferricyanide crystals. With the print still in the fixer, he would take a small amount of fixer directly from the fixer tray in a small container (a shot glass, a one-ounce "graduate", or one of those disposable plastic condiment cups from the fast-food place), add a few crystals of pot ferri until the color was right (about the color of weak tea, or as someone said here, healthy unine). Then he would take the print out of the fixer, drain it and blow away the surface moisture, and paint the bleach onto the print using either a small brush or a cotton swab. Then he would drop the print back into the fixer to stop the bleaching action. He would repeat this process several times until he achieved the reduction that he was looking for.
George would also bleach or intensify negatives as he felt they required that kind of torture.
It's really interesting to watch a master printer work!