Briman,
You still need hot water to clean it up, and need solvents and a brush to remove sabot fouling. I think new shooters are being sold on a falsehood that the new improved muzzleloading is easier to clean up
With the advent of the new Polymer plastic - plastic fouling is greatly reduced - in fact I have never had a problem with plastic fouling and I rarely use brush and solvent... I do use hat water though. I have inspected the bores of my guns with a bore scope and really can not see much in the way of plastic. And for cleanup all do is stick a hose in the breech area and run hot tap water through. On occasions I will run boiling water through but not very often. I have shoot real black powder but i do worry about corrosion so I now shoot t7 that relieves some of that concern. Often during the season I might not clean - I mean strip clean the gun until the season is over so using t7 gives me less worry in that requards. So again t7 works better for me.