I've neutralized dozens of pipes. So it's very possible to rid your pipe of past loves and other mistaken judgements. But there's one part of the process that everyone overlooks and it's not a minor part, cleaning out the mortise, really and sincerely cleaning out the mortise. Old evils lurk in the mortise. All of the above suggestions are good as far as they go (well, not the lat bomb suggestion) and there's also retorting when several S/A treatments don't quite do the job as well as ozone and baking the pipe with activated charcoal. But the entire airway needs to be neutralized, not just the bowl.