I swab, not clean, after every two shots. I use a damp patch, then a dry patch. The barrel is by no means "clean" but it keeps the fouling from too much buildup, so I don't get a ball jammed. I use 3Fg in my .54 which seems to give me much more ash, and a thinner layer of that ash, but I'm also in a Mid-Atlantic state, and humidity is pretty high here. We have days in summer with 110% humidity, as the air gets so hot sometimes that it will hold more moisture than is "normal" and become "super saturated"..., and then at dusk when the air finally cools we get a gully-whopper of a thunderstorm.