Yours looks a little more carbonized than mine did, but a few people in the thread have mentioned some success with
Barkeepers Friend and an
electric scrubber. Using this method, I was able to get it looking better than my brand new unused unit:
To be fair, the blue unit has been sitting unused for about 2 months so it's oxidized and changed colour a bit on its own.
I did finally end up using the blue unit and recorded the first colour change for reference. There's a pretty significant colour shift on the top copper band starting at about 30 seconds into the video. I forgot how dramatic the colour change was the first time. I recall the Founders Edition behaving a little different on first heat up, but I assume that has something to do with the different type of SS used.