I have used the light grey #7448 ultra fine Scotch-Brite pads. Best if they are a bit worn, meaning not brand new. Wear them down a bit before applying them for fixing the brushed stainless finish on your pistol. Always rub with the grain which should be easy in your case. My Anaconda was in much worse shape. The gun had hardly been fired at all, be the previous owner did not take good storage care with his guns.
Before and after on a Colt Anaconda. Link is safe. It's my personal website. Just didn't want to post a gazillion photos in your thread.
Sand them out with wet/dry paper with a little water on the paper/area.
start with 5 or 600 and see if it's taking out the marks.
Sand along the length of the bbl, try not to go cross wise.
Go lighter in paper grit until finish looks good.
or as mentioned above gray scotch brite pad
Some people also do small circles with the scotch pad
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