I've found a dry brushing about every 25 rounds with a tornado brush cleans up just as easy for me.
I still go the hot water route for my muzzleloader but for my Black powder cartridge gun Balistol a good brass brush and the garden hose followed by patches and a good high pressure blow job is hard to beat.
Balistol must be working because it makes those brass brushes look like new.
L.F.