I've been using Edwal LFN for a few decades, never any issues. I switched from photoflo because it was gumming my reels unless I scrubbed them after use. My formula is two drops LFN per liter distilled water, plus one capfull 91% isopropyl alcohol to speed drying. I also shake excess rinse from reel before hanging film to dry, no spotting or streaks ever.