I HAVE THE ANSWER!!!!!!
I had a bit of gold starting to show on the new kerker so I decided to try
the 3m Chrome and metal polish we picked up from the paint supplier.
It took it off. Then I decided to try it on the real blue (almost black) Ducati pipes.
I wish I could show the difference to y'all with the pictures I took but they
don't do it justice. It took about 3o minutes on the front pipe but
it shines and is clean of the bluing.
It really works. I don't remember what we paid but it was an off the shelf product.
Hey Ernie, what happened to the stainless pipes? This stuff may work on stainless too!