I'm amazing you were able to remove most of the grease in a bath. I've had grease stains on purses before that didn't budge.
First I wanted to add my admiration to the job of getting that grease out, I consider it fantastic what a transformation, congrats!
And just like Whateve I also had back luck trying to remove grease, it was a small spot on the back side, so I can live with it, but my effort was more like trial and error for possible future stains, it didn't work so I stay away from grease. Perhaps in this case came out because it was a fresh stain, versus who knows how old the others were.... Dawn definitely works on grease.
I put a lot of dawn in the bath when I dunked it... probably at least twice as much as I normally use. There was so much grease all over it I was willing to take the chance. And you're probably right about the stain being fresh making a difference too! This was the first time I used Blackrocks and I will swear by it. It did a great job of masking the unevenness still left after the bath and conditioning.