I imagine you can use any solvent, Southren old timers like me use coal oil, (That's kerosene to anybody north of Blue Eye) and Hoppes should do fine. Just be sure to remove the grips first! I use an old toothbrush and give it the dickens, Then I clean the bore and use a light coat of bore butter, and grease the arbor (cylinder pin) with bore butter or Crisco to keep the cylinder freed up, put a little never-seize in the cone threads and reassemble. And on a divergent note, the 1860 Army can be very accurate. I once plugged a Mallard drake on the ground at about 22 yards, one shot, DRT.