The post I put is of a couple of stones from my yard but mostly some metal pieces. I do have those pieces soaking in vinegar like you said. I’ll try to get them cleaned better and repost. ThanksCould you point out what you see as Native American? I don't see anything altered by man...only natural rocks. (just fyi, been hunting collecting Native American artifacts 40+ years). Soak the iron items in apple cider vinegar for a few days and maybe what's under the rust will reveal itself.