Elkinde....
For a complete cleaning of your muzzle loader you must always pull the breach plug. This is recommended for all short and long term storage.
During hunting season some guys get by with just a barrel cleaning---you know for day to day hunting over the short haul. I personally clean my MZ ASAP after firing. The exception being if I'm hunting....then maybe just a barrel cleaning.
Lets be clear....If you have a side lock or flint lock, in most cases, the breach is something you don't mess with. Cleaning is usually done from the muzzle.