If you have heavy fouling after a couple of shots, you'll need to swab the bore.
Years ago, an oldgent with a collection of original flintlocks showed me all about patches: beef or deer tallow and beeswax. More tallow in the winter, less in the summer.
apply the patch lube to both sides of a patch, then lay the patch on a flat surface and scrape across it with a flat & square blade (or credit card). This removes all excess lube that will quicket foul your bore.
More recently I've adapted a concept outlined by a long-tenured member here, using "dry patches". I've replaced an emulsified water based-mineral oil 'lubricant' with caster oil dissolved in denatured alcohol. Easily applied to patches with a dropper or pipette, the DA carrier evaporates, leaving behind a lighter and finer amount of caster oil absorbed into the patch. It is dry to the touch, won't dry out over time, and it doesn't stink.
I've gotten over 35 patched balls loaded and fired with no appreciable fouling or difficulty loading from a .62 cal Fusil. 6-7 rounds with a PRB in a rifle, compared to the tallow/beeswax 2-4 rounds fired.