Daryl, Green and an odd odor? It could be a diesel engine carbon dissolver called Centralube. An elderly friend was once a farmer and swears by it for soaking rusted parts loose. It may take months, he says, but it'll soak the most stubbornly rusted machine or gun parts loose. I used it on my rusty crusty M97 Winchester Trench Gun action I found in his barn and it looks almost presentable.