Scratch avoidance is straightforward:
1. Once the film is on the developing reel, never touch it except to remove it from the reel when processing is finished, and then only hold it by the ends.
2. The last rinse should be in distilled water; it can evaporate without leaving deposits or marks.
3. Never touch the film when wet. Not with fingers, squeegees, towels or anything else. Hang it up to dry and leave it alone until it dries by evaporation.
I'm sure there are users out there who will disagree, but this method has worked for me for 40 years, and I learned it by experience. It became especially useful in my Efke 25 days; that stuff would scratch especially easily. And of course, it won't prevent production defects.