Re: Ultra Heavy Fouling - How to remove?
Get a wooden dowel from your local hardware store. Carve little barbs in the end, make it look like a porcupine. Wrap steel wool around it. Add a good penetrating oil. Attach your electric drill at a slow, safe rpm and have at it. Finish with a few swipes of JB bore polish. If it's pitted there's nothing that can be done.