It would appear to me that a factor in this process is the different conditions of the water in different areas. I have always used tap water with Kodak foto flo at about 1/2 the recommended stregth. roll films get a squeege and the 4x5 sheets just get a "light shake" then I hang them in a "cabinet" that I made from a plastic wardrobe. No streaks and no dust.
I would also like to say that there is a right way to use a squeege. It should be purpose made, soft rubber with "overlapping lips", and it should be rinsed in warm water before use and, of course, it should only be used on film that is really soaking. If these steps are followed then even moderate amounts of dust will not cause scratches (in theory ). It sounds like this method would not work for Les because he gets water marks. I am speculating that this is due to the water ....

Tim