if it were me i wouldnt get to worked up about getting it clean to a new like bore.
id just fill the bore with outers foaming bore cleaner let it sit for 15 to 20 minutes. then scrub the bore out with brush then hit it with some dry patches. then repeat ounce or twice more and take it out and see how it shoots
if it shoots good after that id leave it and get on my twice a year bore cleaning schedule. if its shooting as good as i like i would not attemp to get anymore fouling out. acuracy might fade off after that and it may need to be fouled back up to shoot tight again.
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