Wipe the soot off before it's cool.
I read it here awhile ago, but I actually remembered to throw a couple paper towels in the range bag tonight. When done shooting, I hit the Ruger with one. 99 percent of the soot wiped right off with just the dry paper towel, including most of the thick buildup on the outside of the cylinder that Hoppes barely makes a dent in if you wait a few days.
Would probably be good to throw some Harbor Freight 5 mil nitrile gloves in, too, to keep the leaded soot off my hands a little better.