i have tried a lot of things to clean the bore and most work. the best thing i have ever used is Windex. it is far above anything i have ever used. it melts the the burnt powder. when i clean my bore, i only stop when i get a white patch out the bore, i clean it thoroughly. after your cleaning patch is black you can spray it and the black mess will melt out of it and can be ran back down the bore. i now clean with less patches and faster. with the lock off i spray it with Windex and the burnt powder melts off that with no to very little brushing. then lube and you are done,,,,,,,,,,,,,