My inlines with BH209:
Soak some patches with BH209 solvent, swap the bores clean and follow up with a few dry patches. Run a lightly coated patch down the bore with montana xtreme gun oil.
Get a few q tips with BH209 solvent and clean the face of the frame, dry and replace barrel and fore arm.
Breech plug care: Use #32 drill bit *cva size* and clean carbon out of plug, Take a solvent soaked patch and wipe breech plug clean.
Simple as that.