Yea well...
That fella can do as he pleases it's his gun. As for me, I'm a "flusher". I've been a flusher since 1973 and will probably die a flusher! There's no way that I would be convinced that ALL of the residue is gone from his barrel because of some homebrew he siphons back and forth from a jug to his barrel. Getting that crud out of the powderwell and nipple area takes soap and water under pressure. But if he's satisfied with the job when he's finished, so be it.
BPS