When I lived in Hawaii that was a different environment (90% humidity and 300 inches of rain a year) and many shooters would put oil down bores and then spray a boresnake with carb or brake cleaner and pull it through before shooting. I watched blued steel rust overnight if you forgot to wipe it down and stainless would follow suit if you waited a few days.
Now I typically clean with wipeout or patch out, push a dry patch through to finish and put nothing but bullets down it until it starts to shoot bad. I just cleaned a .270 down to bare steel after several hundred rounds so I could look at the throat. First round out at 200 yards landed in the middle of the group from a "dry barrel".
As smokepole mentioned I would be leery of anyone promoting 4 strokes of a brush for every round fired unless he owned a barrel shop and wanted to push sales.
Doesn,t Wipe out contain a rust preventative ?
