You could do that, but then your next question posted in this forum would probably be how to remove a jillion scratches from your stainless reefer.
Since you don't know the origin of that "something," it could be hard for anyone to tell you how to remedy it completely. One step could be to call the manufacturer's customer service line for advice -- they made the thing, so they'd probably the your best source of info.
Otherwise, and I take absolutely no responsibility for this one should you actually try it, you might ask if a HIGHLY watered down solution of muriatic acid (available at swimming pool stores in the chemicals section) would do the trick. Guys who restore old bottles use muriatic acid/water solution to remove really stubborn decades-old water stains, and it almost always does the trick. But even there, that's the effect it has on glass, which your reefer ain't; it may end up slightly etching the stainless or reacting chemically in ways you really wouldn't want to see. Muriatic is basically sufuric acid, so you'd also have to wear gloves and open all the windows for ventilation, and wear a mask so you don't breathe in any of the fumes.
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