KROIL will not remove moly, thats for sure. What it is excellent for, however, is removing powder fouling while you are doing the initial shooting with moly to get a barrel "plated up", and keep it that way afterwards.
One the barrel is moly'd, I put a single patch with Kroil through the bore after each shooting session, then one dry, then one more wet with Kroil and into the safe.
Have never used a copper solvent once I had a barrel moly'd. My experience is the same as Maynard's, they just do not metal foul anymore, even after many hundreds of rounds, and still going strong.
Ted