Cleaning the rifle today, used Sweets and a brush. Ran several patches through until they came out clean. Thought we were good to go until I ran a patch through with naptha on it - wrong! Two patches came out very dirty. Four patches into it with the Naptha and all was good. Is this barrel finally clean? Why did the Naptha pick up what the patch wouldn't before? Kind of makes me nervous to use any cleaner with ammonia in a non-stainless barrel without running something else behind it to get out all the residual goo. Thanks for the input.