I agree on the importance of using pure water, using enough wetting agent (photo-flo), agitating, and soaking rather than dipping.(posted 8227 days ago)Another thing I have found very helpful:
After thoroughly soaking the film in water and wetting agent, remove the film from the tank without pouring the water away. Unreel the film, and hold it up (making sure that if there are any remnants of paper or adhesive tape attached to the film, these are at the bottom - this obviously only applies if you use rollfilm). Now pour the water from the tank (containing the wetting agent) down the film, starting at the top, and working your way gradually down. Make sure that every bit of the film (to its full width) is properly wetted whilst doing this. Do this on both sides of the film. Make sure that the film does not touch anything whilst you are doing this - a real possibility, as the film tends to ride up whilst you are pouring. Do not shake the film, allowing any excess that wants to run off to do so naturally for a few seconds. Now hang the film up gently.
Hope this helps!