I have been shooting over 45 years...I think I still have my first bottle of Hoppes #9 solvent in my cleaning kit..[a joke] ....For removing copper fouling I use Tipton amazing whatever ammonia based solvent..& Kroil oil to finish..I'm no expert...So I ask What do you guys use to keep the barrels clean??..Oh, The Reason I ask is I had a guy swearing up & down that SHOOTERS WASTE TOO MUCH MONEY on bore cleaning crap..He Swears by ammonia & dawn dishwashing liquid..Then WD-40...to each his own...Please tell me your fav solution..Mike in Ct