The last 3 barrels I have polished, I used PB Blaster in leu of Kroils because I was out. That stuff just plain ROCKS!! Fairly high viscosity, penetrates, lubricates, floats away debris like a champ, and don't forget about how it will loosen frozen/rusted parts! I soaked a pair of completely rusted needle nose pliers I found at a local trout stream in it for about a week. Couldn't move em by hand no matter how hard you tried. Loosened up the rust and now they work like new.