I don't know the dynamics of negative washing. I'm pretty sure certain substances that are in my well water are not well absorbed by the gelatin, because when I get the surface water off I have no indication on the negatives that the water was anything but distilled. If there is any absorption into the emulsion of the calcium-magnesium compounds that make my water hard, I doubt that a surface rinse would remove it any more completely than a surface wipe. These wiped negatives have been kept for over 30 years with no sign of anything but film base, emulsion and silver. The only times I got any streaking were when I did NOT wipe the negatives. There was a time when I used a sponge squeegee, but found a soft clean cloth to be better. Old-fashioned cloth diapers are my current favorite.