J-B, a formula developed by Jim Brobst and produced under an exclusive license has been around since the 1960s. It has proven to be a champion in cleaning gun barrels with burned-on, caked-in powder residue and copper jacket fouling. The formula has a unique combination of ingredients and a multi-step mixing process that gives it its soft paste consistency and non-embedding feature. This means that the paste liquifies and wipes out of the bore easily without leaving any abrasive residue behind.

Gunsmiths have been using J-B for years as a magic cure for customer guns that don't shoot anymore, as it restores accuracy. Match and varmint shooters use moly-coated bullets that create a cleaning nightmare due to the large amounts of copper fouling and burned-in moly, but J-B makes short work of it. Additionally, J-B can be used with the Lewis Lead Remover to remove the last speck of leading out of pistol bores. Shotguns combine lead, powder, and plastic fouling, but J-B cleans it all out quickly and easily.

Respected names in the shooting industry have praised J-B. Jim Carmichel, a gun writer and dedicated shooter, routinely uses J-B on his very finest benchrest rifles. When no other bore cleaner will get the job done, J-B always will. The late Warren Page, a benchrest shooting legend, was the first to write about the praises of J-B when it was introduced to the shooting public. He described it as "an ultra-mild, abrasive oil paste, finer than jeweler's rouge" and "the answer to problems of metal fouling and serious powder fouling that solvents either won't touch or will cut only by much labor." Furthermore, he found that "such an extremely fine abrasive, used with discretion, would take out caked powder residue and mild metal streaking without ruining the bore."

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