I used a cheap barrel cleaning kit but as a pull through.I carefully wrapped the steel rods with a layer of tape to protect the crown first. Maybe if you havn't used solvol before try some on some steel to get an idea of how abrasive it is first.On a pcp i remove the barrel first & clean the port to firing valve after to remove any traces of the paste, you won't need much though. The difference it made was from an inaccurate pellet fussy gun to one of my best barrels easily equalling my sons bowkett blueprinted R10 out to 50yds.