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If the rifle is still accurate, Leave it. Powder fouling is what can damage the bore over time. After watching some video's with Todd Hodnett from Accuracy first, I switched to just removing powder fouling, and couldn't be happier with the results. My .308Win has approximately 500 rounds down the tube while only removing powder fouling. It still shoots sub 1" 200yd groups.
In the long run, aggressive solvents and brushes will do more harm than good to the bore of the rifle.