I got some Kodak developer tank cleaner from my local store a year or so ago. They quit carrying it, and IMHO it was damn expensive at that.
Is there a formula out there for a stain remover such as the Kodak one? All I find from B&H is that they won't ship it, and I suspect it has some NaOH or some similar toxic chemical.
Film developing cookbook does not have it, and other threads don't show anything.