Depends on the powder, for Pyrodex I scrub with boiling water and Blue Barrel when I get home and clean in the field with 50/50 mix of windshield washer and alcohol do the same for 777 for Blackhorn I almost never clean in the field don't need to, when I get home a 50/50 mix of Hoppes #9 and alcohol cleans in a couple passes even after 50 shots. I always oil after cleaning with either Montana bore protectant or Birchwood Casey Synthetic oil. If you clean a gun oil it; the solvents will cause rust as fast as the corrosive powders. Lee