The last thing I do is remove the breechplug. I clean the bore the best I can before removing it. Once I remove the plug, I use a one-way patched bore brush & when I reach the threads, I turn the ramrod clockwise a few times to clean.

I do this with a few patches -- all one-way in & no dirty patchescome back out thru the muzzle- then use a shorter wire brush made exclusively for the breechplug area. You can find them on ML accessories shelves where stuff like jags, nipples, 209primer holders & plug grease are found. They usually have a 5-6" long wire attached with a hole at the end big enough to stick your middle finger in - for sliding up & down inside your breech-end.

When that is clean, the entire bore gets gun oil... even those threads. After that, I put grease on the breechplug threads - screw it in - then unscrew it back out. That leaves some grease on the bore threads. I will then re-grease the breechplug threads & screw-in the plug for the last time.