Flintlocks to me are easy to clean. I pull the barrel, take the lock off, and get a pail of water. I have old tooth brushes, and with some soap in the water scrub the back of the lock off. I then remove the vent liner and clean that. I then water bath the barrel.

After all of that I swab the barrel out with some solvent, and then an alcohol patch or two. After that I dry patch it and finally do the bore with some Birchwood Casey Barricade/Sheath. I like to rinse the back of the lock off with hot water, then spray it down with brake cleaner. After that I wipe it all off and give it a light spray with Sheath.

It takes me less time to clean a flintlock then any other kind of rifle I think.