Thomas, try my method, 30 seconds or so in de-ionised water after wash. Hang in ambient temperature and do not wipe or touch film in any way and leave to dry. Let me know if it works. I have been doing this for many years, with no dust, drying marks or cat hairs.
I have tried it, Clive. No use I'm afraid. Even when there were no cats, but rabbits instead. I have tried five or six different methods, to no avail.
"Often moments come looking for us". - Robert Frank
"Make good art!" - Neil Gaiman
"...the heart and mind are the true lens of the camera". - Yousuf Karsh