A prerinse isn't necessary and in some cases is undesirable.(posted 8579 days ago)Develop and stop as normal, then give three to six minutes in reasonably fresh rapid fixer with _continuous agitation_. After the fix, give the film a couple of minutes in HCA, then wash normally.
Anchell & Troop (and also Crawley I believe) suggest that standard sodium thiosulfate fixer just isn't sufficient to fix newer-style films and recommend rapid fixers. I don't know whether they believe the fixer can't fix the film or that it was take an inconveniently long time; they don't explain.
The following comes from Kodak publication F-32, iow, the instruction sheet....
Fix at 65 to 75°F (18 to 24°C) for 3 to 5 minutes with vigorous agitation in KODAK Rapid Fixer. Be sure to agitate the film frequently during fixing.
Note: To keep fixing times as short as possible, we strongly recommend using KODAK Rapid Fixer. If you use another fixer, such as KODAK Fixer or KODAFIX Solution, fix for 5 to 10 minutes or twice the time it takes for the film to clear. You can check the film for clearing after 3 minutes in KODAK Rapid Fixer or 5 minutes in KODAK Fixer or KODAFIX Solution.
Important: Your fixer will be exhausted more rapidly with these films than with other films. If your negatives show a magenta (pink) stain after fixing, your fixer may be near exhaustion, or you may not have used a long enough time. If the stain is slight, it will not affect image stability, negative contrast, or printing times. You can remove a slight pink stain with KODAK Hypo Clearing Agent. However, if the stain is pronounced and irregular over the film surface, refix the film in fresh fixer.
Wash for 20 to 30 minutes in running water at 65 to 75°F (18 to 24°C) with a flow rate that provides at least one complete change of water in 5 minutes. You can wash long rolls on the processing reel. To save time and conserve water, use KODAK Hypo Clearing Agent.