Birchwood Casey Bore Scrubber.
Run 1 to 2 DRY patches down the bore to remove the loose BH209 fouling, soak one patch with bore scrubber, swab the bore and allow it to sit for 5 to 10 minutes, follow up with another wet patch. Normally 3 to 5 patches is all thats needed. Dry patch the bore, follow up with your favorite gun oil.
Breech Plug: Run 1/8" drill bit down the flash channel and turn it with your fingers to remove carbon build up. Head over to sink and with hot water, use an old tooth brush and scrub off the BH209 fouling. It cleans up easy with soapy hot water. The aid of Q tips may also be needed in the concave section of the breech plug, as well as the primer pocket.