i have had a problem in the past with removing some black off of cases. My problem was too much spray lube. If I run into that now I just add a little bit of mean green (dollar gen), run it for a little bit, rinse and do my regular. I found that sometimes the dawn just cant cut the Hornady Spray lube if it gets applied too liberally. Not usually an issue but occasionally. My needles have been in service for a few years now, they have cleaned thousands and thousands of rounds and I dont see an issue so far.

Jason