I only have colt style revolvers. I added an old toothbrush to the supplies I bring with me. After shooting each cylinder, I brush off the front of the cylinder and the nipples.
I genearally stop shooting after 30 rounds and move on to shooting some cartridge guns, but there is basically no fouling on the pistol after 30. I have no doubt I could shoot another 30. Sometimes if the cylinder is not rotating as smoothly, the arbor may need to be wiped down.