Another vote for PFlo at half strength, and always with distilled water. I also use a graphic arts product called Webril pads. One roll lasts a very long time, looks like a big roll of toilet paper, pads are very soft and thick, and are made for film work. I fold one up into a pad, soak it in the same PFlo mix, and sqeeze as dry as I can get it. Then just swab off each side of the roll of film, in separate passes (not squeezed) just after hanging up to dry. I've been doing this for 25 years, never one scratch, and never dust that I can remember (I built a drying cabinet in the darkroom, no heat or fan). I don't use these with sheet film.