I just purchased a car from Cali, it has never had a "proper" wash, I'll show you the results of iron-x, it was pretty severe. I had to iron x twice and clay bar twice on the car for a perfectly clean surface ready to be buffed.
https://youtu.be/hDYHeK6_iC0
You should really watch the video in 1080p
Hope this link works! I just did it yesterday. Finished buffing too it took me another 14 hours.