Ok, now that I'm shooting an auto-loader & tomorrow is first of the month its time for the gun to get its monthly douche. I been using Slip 2000 choke & gas valve cleaner for years, but now I see they have something new called Carbon Killer I put all my gas valve parts in a small cat dish & soak them , then I let the gas cylinder soak in the same solution--cleans up easy Just wondering if the new stuff is better or the same stuff with a different label