One of the most important things to remember when starting to dry negs is to raise the humidity in the drying area. If you are using a bathroom simply run the shower for a little while and that will add enough humidity. This will make the dust settle quicker. Use Kodak Photo-flo at about 1/2 strength as the final rinse then hang the film up and DON'T fool with it until it is dry. The Photo-flo will eliminate the water marks just don't use it to strong as it will leave a scum on the film. If dust gets on the film while it is wet it could embed itself into the film and then the film is ruined. I have never been successful in getting the dust out once it is on the film. Take your time and do it right. Good luck...