Well, if I felt my breech plug face might need cleaning, I alwaus screwed a breech plug scraper on my wiping stick. This would have been on simple flint style breech plugs. Generally speaking I never found them to be that dirty That is if properly maintained.
Postscript,
I clean with tow and tow worm. I find them thorough.

May not be best way for everyone.

Last edited by kaywoodie; 09/24/16.

Founder
Ancient Order of the 1895 Winchester

"Come, shall we go and kill us venison?
And yet it irks me the poor dappled fools,
Being native burghers of this desert city,
Should in their own confines with forked heads
Have their round haunches gored."

WS