Just took this knife handle(?) out the e-tank. It cleaned up quite well! The “before” pic is actually after it had sat in vinegar for probably over a week (before we discovered electrolysis). But this rust still on the inside and on top is crazy stubborn. I’m afraid if I keep it in the e-tank, it may just fall apart. I’ve scrubbed and scrubbed the top and it’s not budging. Should I just leave as is? Or is there something else I can try to remove it? Also....is it a knife handle?? Thanks!