That’s interesting about removing the bloom, I’ll have to try it on something. I suppose technically that’s not cleaning but restoration or repair as I assume you are polishing away material.
I have a couple of nicely cut Georgian decanters that have some clouding inside or some staining in the bottom, but that is part of their history (for me). If the staining can only be removed by polishing, rather than cleaning something from the surface, then I will leave mine as they are

. If I saw a sparkling clean decanter purporting to be Georgian, maybe even Victorian, I would be a bit suspicious. Maybe it’s different with bloom, or it depends what you want it for, or the item, or it’s just personal choice.
Shane, that type of decoration will have been used by many different manufacturers over a long period and isn’t very distinctive so you will find quite a few of them, you might even find a stopper with a better fit. There are lots of ‘matching’ glasses too. As for value, you can get a pretty good idea if you search for shaft and globe decanters in sold items on eBay or other sites (I don’t think we’re encouraged to give an opinion on value as it is subjective).