I just spoke with a guy who makes some seriously high end trap guns and asked him what he used to clean his bores. He recomended oxiclean solution poured in the barrel and plugged with a finger. I guess a couple of shakes is all it takes to completely clean it plastic fouling and all. As long as it is dried and oiled I can't see any risk in this. His guns cost more than most cars and he has not had a problem. I think I am going to try it next time my barrel is dirty. If anyone beats me to it, please post results.