James Purdey and Sons Ltd. released three videos about how to clean the shotgun and treat it for storage. The first video is about the barrel cleaning.
I’d add a small trick that I use when cleaning my shotgun barrels. When the bronze brush comes out of the barrel it launches a nasty spray of oil, lead and carbon mixture to any surface it is facing. So in order to prevent that, I usually place the muzzle portion into a plastic bag or sheet protector, which effectively captures all that stuff. After the bronze brush cleaning, you just discard the bag. That helps to keep the bench and surroundings clean. Here is how it looks like:
The second video is about cleaning the action (breech, lugs, trigger mechanism etc.).
The third video is about the wood parts care (stock and forearm). Purdey recommends rubbing a thin layer of boiled linseed oil into the wood. In this video, they also tell how to prepare the gun for storage both for short and long term. They also recommend releasing any spring tension from the internal parts for storage. Particularly, dry fire the gun (with snap caps in the chambers) releasing the mainsprings’ tension.
If you know any interesting and useful tips concerning shotgun cleaning, please let us know in the comments.