Bill,

What is Kroil? I've never heard of it. I tried using the copper, then SoftScrub and last a pencil erasor. So far I haven't
had much luck. The double rifle that I am cleaning up is a very
early engraved Purdey from 1856. It was converted from a muzzleloader to a breechloader. The engraving is beautiful, not
pitted but very dark. I don't want to mess it up.