We have a guy close to home that lived in Chicago for 30 years with work, but he retired back to this area. We were talking about my wood heater and stove pipe setup, and he said be sure to keep a check on that pipe pretty often to make sure it was clean. I told him I was familar with all those things and all but he went on to say throw you a soup can in there every once in a while to keep that pipe clean. He said it was very common up North to do that. It was the first time I had ever heard of it but I just wanted to ask some of you people and get your ideas on it. He claims something in those cans will clean a pipe like new money as it burns up. I would be interested in hearing all your ideas about this.