Ok, call me cheap, a self-sufficient person or just an experimenter at heart but I want to begin the process of developing my own cleaning solvent for my barrels. I read with interest a post a week or so ago with great interest about how to "roll your own." A few suggested the use of the old formula GM TEC. I'm not interested in trying to hunt down the Old formula GM TEC like so many other things in Benchrest and so I'm beginning with some other easily accesable products. For those of you who have some knowledge in this area please help. If a person was to have say, some Marvel Mystery oil, Parson's ammonia and Kroil, what ratios would you mix these three products togeter to make safe and effective barrel cleaner? If there is another product that you have found to be successful that is also readily available throw that in as well. Bro.D