A few things I have found:
- Adding a bit of dishwashing detergent to the borax remjet bath makes the process much, much less messy. The detergent prevents the remjet from redepositing from the wash water back on to the film, sponge, hands and everything else. I found putting the film in a bucket with the borax & detergent for 10 minutes and giving it a swirl removed the backing cleanly with no muss, fuss or wiping.
- Processing really old film as from the 70's results in black film. One roll came out completely opaque - couldn't even see the filament of a halogen lamp through it. The other had some very faint image in the black murk.