FWIW, for years I've used AA's method of going directly from the "plain hypo + sodium sulfite" into the "toner + HCA, and only once had staining due, I think, to my screw-up in mixing the chems. The whole print turned bright orange the instant it contacted the toner, UGHH. But I'm learning in this thread about the long life of the tray of toner, which I was not aware of. Ilford also claims a very long life, and I'll be changing my process as a result.