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I purchased a short shotgun condenser a few years ago, the image is attached.
As you can see in the picture the far end of the tube looks like its oxidized, so I am concerned about this. I think this is happening due to the welds I guess.
Anyway I tried to clean it with vinegar, then with 10% citric acid mixture, it helped but not 100% there is still oxidation visible. I also tried to clean it with the green part of Scotch Brite, but whatever I do there is a section that still show oxidized.
So how can I fix this? Nothing seems to work, thought about sanding but I guess it would not be the correct way.
Also the top surface has been scratched, slightly do I have to polish it or leave it as is ? I mean does scratches create a problem or I can leave them as is?