I think the Birchwood Casey Lead Wipe cloths are as good as any, as I have used them for years. Keep it off the finish as it will remove bluing and case colors if rubbed to hard. Although they are to be used in bores, cylinder faces, etc, I have used them a little to antique some guns in the past, and if used right they do a very good job.
NCOWS #810
Reno