It's stainless steel, so steel wool, barkeepers friend, and 5 minutes of scrubbing from the owners day-laborer gardner is going to clean that off. If you want to permanently etch stainless steel you're going to need acid gloves, a Mason jar of Hydrochloric acid, and a Tampico fiber acid brush. :)
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And, for the record I'm just here to provide helpful facts and safety tips. I would never ever condone or encourage any bsky user collect the materials and then research how to use them safely to cause irreparable damage to an IncelCamino. So nobody do that, It's not cool. Think of the children.