I use plain old Windex that has Ammonia in it,,,Inexpensive .easily available,easy to use and it works Figuring "back in the day" there was a limit to what was available to clean anything, they had to go simple or stay home,,Clean then clean again and don't forget the oil,grease,,,rust preventive of your choice.
Then to "back in the day" their life depended on their rifle so they were very sure to clean it everytime they had a chance,not put it away and get,"around to it" someday.
Windex with Ammonia,, been working for me for about,,47 years,got started late in BP,
Clean is right next to reliable,,
Lots of options on this posting,,so pick one and try it,,if it works,, good if not pick another,,,,
and always drink up stream from the herd,,,