There have been a number of threads relevant to my question but none that quite settles it to my satisfaction.
I process my B/W 4x5 negatives in trays and would strongly prefer not to invest in any new equipment (e.g. a fill/dump washer). Thorough washing after fixing is obviously a major concern, though, and to be on the safe side I've been putting each batch of negatives through 8 to 10 baths of water, rocking the tray to agitate, and letting each bath stand for 5 or 10 minutes to let the fixer settle to the bottom. Because I don't want any scratching, I place each negative in a separate tray, so the washing process basically occurs in 5 or 6 trays simultaneously.
This procedure is tedious, but is it necessary? Maybe I'm overdoing it (or under-doing it after all?). That's why I would be interested in hearing from others who tray-process their large-format negatives about how they wash them, about the effectiveness of their routines, and about how they avoid scratching and related damage.
Thanks in advance!