Why would it be smeared over the bell ? A picture might be useful.
The thicker solder can be heated and wiped off. You'll get a certain amount bonded to the surface which can be removed with abrasion, but it'll probably take off the silver plate too. So there's a good chance you'll need to replate if you try and remove the solder.
I just learned at a repair clinic that you can remove solder on a silver plated surface by rubbing it with artist's charcoal. Coates Willow Charcoal was the brand shown in the presentation. I haven't had a chance to try this myself yet so I can't share firsthand experience on how well it works. In the recesses of an engraving, it may be much more difficult to remove.
It looks like a soldered tonehole was repaired and a big glob of solder dribbled down, and then someone came by and tried to wipe it off while still molten and did not do a good job of getting it off.
I would suggest that the first thing you need to do is make sure that tone hole with the black line around the joint to the bell is solidly attached and leak free. It seems as well that there should be a key guard over that tone hole. And the key guard that's visible at the top of the picture needs to be resoldered.
Once that's taken care of, my (poorly informed) first suggestion would be to heat the bell area up to solder melting temp and try to wipe the old solder off with clean fine grade steel wool (like 00 or 000). You would want to be sure not to press very hard.
Once the solder thickness is reduced to just a fine film, you MIGHT be able to take the remaining traces off and re-expose the silver plating underneath by proceeding VERY CAREFULLY with a mild abrasive polish. The color and luster of polished solder and polished silver plate are different enough that I think you could do this, just a tiny area at a time, under good lighting.
Unfortunately, solder will enthusiastically wet silver, even more so than brass, with or without flux, so you may not be able to get it completely off without going through the silver plate here and there. You might end up doing some spot re-plating in the area if you really want the best appearance.
Thank you all for your input. My theory is the same. Someone tried to remove the solder but messed up. It's from the guard post though and the tonehole is fine. It's probably some kind of burnt material as I see no leaks from the inside.
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