I have had issues in the past with both water marks and dust/debris, or some residue, on my dried film. I process both rollfilm and sheet film. I don't have a bona fide film drying cabinet, however, and my darkroom is located in a corner of my otherwise dusty/much used garage.
What I've found that consistently works for me is I transfer the rinsed film in a closed container (plastic 'tupperware'-type with lid, for sheet film, or the developing tank for rollfilm) from the darkroom to my small bathroom. The bathroom is prepped before hand by removing all towels and throw rugs (it has ceramic tile on floors and halfway up the walls), and then I run the hot water in the shower for several minutes. I set up a metal curtain rod in the shower, dedicated for this purpose, along with metal bulldog clips, with metal hangar wires, that are also dedicated for this purpose.
Once in the enclosed bathroom, I mix DI water, 91% IPA (isopropyl alcohol, not India Pale Ale; that's for later) and one or two drops of Photoflow. I mix it gentle but well (to avoid sudsing), then each sheet of film is repeatedly dunked and allowed to drain off, several times, before hanging in the shower. For rollfilm I repeatedly dunk the film reel (gently to prevents sudsing of the Photoflo), and gently pull the film off the reel, squeegy with two fingers of my prewetted hand, and hang got dry with a counterweight on the bottom of the roll to permit it to drain properly. Then close the shower door to minimize intrusion of air. For sheet film I also place the tupperware dish of IPA/DI on the floor of the shower stall, below the film, with the idea that the IPA vapors from the liquid will contribute to the drying effect by scavenging additional moisture from the surface of the film. If I had a dedicated film drying cabinet I would do this there.
I keep this bathroom closed up for several hours, with the bright lights on to add a bit of heat without stirring up the air.
