I haven't seen any reviews for the sister product sold with Flitz polish. J-B bore cleaner works great at removing fouling in any pistol or rifle bore. After a thorough conventional cleaning I wrap a bronze brush with a patch and coat it with J-B cleaner. Run in thru the bore 4-5 times then run a wet patch thru with a jag. Unbelievable what comes out. Patches will be black 5-6 or even 7 times after each use of a bronze brush / patch and J-B bore cleaner. J-B does what they claim it will do. It cleans like nothing I have ever used before.