Well today I cleaned the three inch barreled model 36 I bought a few weeks ago. Man was it dirty, I bet I spent an hour or so cleaning the bore. I finally had to resort to Hoppes #9 to get it clean. I've read on this forum for light surface rust you can use brass wool to remove it? Any other tricks for removing light rust or should I give up? She was made in 1971 when I was a sophomore in high school. It has the square butt.