Yes indeed, all polishes are abrasive (some more so than others); that's what makes them polish (i.e., remove small scratches), just like polishing compounds for an automobile finish or sandpaper for wood. In all cases, you are actually removing a fine amount of the material on which you are working (e.g., paint, wood, brass). Tarnishing of brass, however, is basically an oxidation process, somewhat similar to the rusting of steel, so just like there are some chemicals that will remove or neutralize rust to some degree without polishing, there are also chemicals that will remove tarnish to some degree from brass without polishing although it still comes out looking somewhat splotchy and needs a light polish to really look good. At one time, Buck actually included a very small package of Fitz with their knives as they left the factory; don't know if that's because Buck recommended that particular polish over others or if Fitz was advertizing their product through Buck. In either case, however, Buck would not have included something that they did not think would work well. Another item that I don't think anyone has previously recommended is that you can purchase (don't ask me where) a jeweler's cloth that is impregnated with a compound called jeweler's rouge, and that is commonly used in jewelry stores; it works well and is minimally abrasive in my opinion.