Long ago I sometimes had to make many 8x10 prints on RC paper. With a washing aid and perhaps longer washes, the same technique would work with fiber paper. The prints were washed about 30 at a time in deep plastic dish trays with constant shuffling. After a few minutes they were transferred to a second tray and the process repeated, then to a final tray, again with constant shuffling. The first tray was then dumped and filled from the second tray. The second tray was filled from the third tray, which was filled with fresh water. The process was labor intensive, but otherwise efficient. It used only a few ounces of water per print. Those prints from 40 years ago have survived in good condition.