I've always had Hawken style sidelocks that the barrel comes off easily to clean in a bucket.
I ran across this video of a new simple way to clean, and thought it would be great for long guns that don't have an easily removable barrel.
Take a look. The first part is normal with patches, but watch what he does with the jug.
http://www.youtube.com/watch?v=GUJkXKHLY5w