I wrap a cotton patch around a bronze brush, wet the patch with solvent, (Ballistol or Breakfree Clip or WD 40 or whatever) and push it through. Repeat a few minutes later. While waiting I use a chamber sized brush and patching on the chamber. Back to the bore brush and patch. Then switch to an old style blackpowder jag with a patch for final wipe before using the jag and an oiled patch. (I resize the jags to give me snug fit with the patch that passes the choke without undue force.)