i have never shot "all day" but i have shot 30-40 times or so in one session. water/dawn dish soap, 50/50 mix. the first tight patched ball will slide down the bore like as smooth as a silk, the last tight patched ball will do the same. i can load my guns without a ball starter even on the last shot, patches comes out perfect and accuracy is the same. the gun cleans better using this also. i know in the 1700s they never used this method, but they would have if they had it,,,,,,,,,,,,,,,,,,