I shoot both a 50 caliber TC Hawkin and a TC Black Diamond using only Black Powder.

Two patches soaked with Windex gets 95% of the fouling out. The third comes out fairly clean. Three dry patches and usually the third is about as clean as when it went in.

Then I run a wet patch down the bore of Denatured alcohol.A dry one, blow it out with a compressor then a coat of Bore Butter and I am done

If God wanted you to walk and carry things on your back, He would not have invented stirrups and pack saddles