Thanks SmoovC, I really can not get something on the grille quick enough! I went out after the new grille install and took additional pictures of the top and bottom pieces, and I was shocked to find this! This is from the new bottom piece, (with only 28 miles of clean highway and 11 clean city street ) miles on it. And no water, dust, road debris, grit, sand nor chemical's at all, involved. ) I rinsed the spot off and wiped it with a soft microfiber towel and was nauseated to see it and the fine scratches a light wipe of the towel made on its surface. This is exactly how this starts and spreads across the whole grill. I know every Santa Cruz owner is experiencing this in one form or another and to a varying degree. It is missed or dismissed as water or dirt spots. I too, thought the same. Yet after someone else posted about their grille peeling and looking at another's pictures of huge jagged sections, I just dismissed it as mine is not doing that. Yet it was. Just differently. I have posted pictures of the new bottom piece, old bottom piece and the cloth I used to wipe it with. My findings: It is a poor thin grade of chrome. A poor bonding process used to adhere it to its substrate. No water, bugs, grit, road debris or road salt, nor chemicals are needed, to separate the chrome from its substrate. Only air velocity and air particles. My rear chrome piece's are not peeling. No peeling of rear chrome pieces reported.
* Update * The later posting has been revised.
Going forward : If this should be, and revealed to be; A decorative plated chrome or spray on chrome painted processed part(s), I have and will continue to care and maintain said parts under proper paint care.