Alright, I'm finally admitting defeat by posting a plea for help.
I've been developing film for years with no issues. Suddenly, the last six months or so, I'm fighting a very frustrating battle with streaks on my B&W negs.
Basically, I'm getting some sort of brownish residue on my negs that, when I squeegee, turn into ugly streak all the way down my neg strips. The residue does not rinse off easily, but does come off if I run my fingers over it. I haven't changed any part of my process in years, so it's not an issue of a new product or a change in work habits. It happens with all film brands and formats. It's totally infuriating.