I feel your pain. There is probably nothing you can do that will get all the scratches out. A lot of painstaking sanding with fine sandpaper wrapped around something flat for a lot of hours might get you close. Buffers and compounds might get the scratches out (not likely) but you will end up with a wavy surface if they do.
The best I can tell you is next time don't use solder. There are some guys who have mastered solder and have earned our respect. For the rest of us JB Weld is a much better and far easier approach. Clean, neat, no flux, and just as strong as it needs to be. There is a technique to using JB Weld but it is much easier to master than soldering ...
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