All correct, and as others have chimed in. Those marks run pretty deep and to truly get it out completely, you almost always have to change the shape of the bowl Perhaps you could compromise with getting most of it out, then using a dark stain to disguise the disfigurement.IMO it’s time for a complete refurbish, someone who works with stain on a daily basis, has a ton of experience AND is actually good at it could make it presentable. It would be easier,faster and look a lot better to strip and refinish the whole thing.






