After I made my leather conditioner out of beeswax and bears oil, plain water would not take it off my hands. The water just beaded up and left my hands with the mix still on them. Water will clean BP fouling, but when it is mixed with lube, it may be harder to remove. Dawn dish soap is amazing how well it works and a little took all the goo off my hands. People have so many different concoctions for patch lube that many may be water resistant. I might think it would work the same in a muzzleloader barrel. Nothing fancy, and little dawn and water will remove all lube and fouling residue.
Ohio Rusty ><>