That's pretty much how I do it too. I bind a fluffy rag around the lock mortise to catch the black goop that spritzes out the touch hole in order to keep that effluvia off the wood.
For de-mountable barrels, such as found on half-stock guns with hooked breeches and forend keys, and muskets with barrels banded to their stocks, I take a different approach. I step into a hot shower with barrel and cleaning rod in hand and clean it at the same time I clean myself. Away go troubles, down the drain!
