I have used cleaning solvents that are frequently mentioned on the site with good results. I recently was working on an old A3Springfield that had years of crud in the barrel and proved to be stubborn. A friend of mine said to try the foam cleaner "Wipe Out". I did, and within a brief period the barrel was literally spotless. Carbon and copper were completely gone in a matter of minutes! Somewhat messy, and sticky feeling, it worked better that anything I have ever used. Any experiences with this product, especially using it with high grade barrels. This stuff seems too good to be true.