After putting arround 250 rounds through my Sig yesterday, I went home and started the cleaning. I used the routine outlined here at TFL many times: Hoppe 9-wet patch through the bore followed by the brush about 20 times back and forth (also wet with Hoppe), and then a clean patch through the chamber end. Well, after repeating this cycle for probably 15-20 times, I still got a dirty dry patch at the end. There seemed to be no end to it -- I ended up spending almost an hour JUST TO CLEAN THE BORE! What am I doing wrong? I know, sounds silly, but it seemed to me I started to "dissolve" the steel of the bore itself. IT JUST WOULDN'T STOP COMING OUT DIRTY!! Every single "last" dry patch had dark indigo or blue color when coming out on the muzzle end. I also noticed that if I ran at least couple of more dry patches at the end of each "cycle", the very last one was, indeed, clean. "The hell with it", I said to myself, "I can't afford spending a whole hight breathing the Hoppe". So, I just stopped and spend another 20-30 min on cleaning the frame, spring, rod, and magazine. What in the world was it -- is it normal?