Right. For me it was always the yellow channel that took forever to flush out. PF is certainly a good way to proceed for that color. Then you will need to clean out the PF pink color.
My advice would be, if you see a color that takes much longer to clean out, happening in the light inks, create a 24x40” rectangle in photoshop of that color, medium value, and run as many as necessary until you see see a clean gray. You can do this with cheap bond paper at high speed. I would buy a 24” roll of the cheapest bond paper paper you can find. Even butcher paper would work. I usually did about three pair cleanings of the problem color first though.
John