There are three basic methods for cleaning.
1) Hot water and soap. Some prefer warm water.
2) Solvent washes, like mineral spirits Ballistol or equal.
3) A combination of 1 And 2.
There are some barrel makers that claim would never let any water near their barrels. When I shot BP or Pyrodex and that was a long time ago. I used warm water followed by a solvent wash. Currently I only use solvent washes after a soaking period. ....
Be Safe !!!