I believe the internet address is
www.zainobros.com. However, any good claybar (mothers, etc.) will work the same, and I love Zaino finishes.
However, I cannot believe a claybar will remove orange peel. It will remove foreign substances in the paint, and if your vehicle was shipped by rail, you could have what is called rail dust. If the orange peel affect is primarily on horizontal surfaces, I would hazard a guess and say it is rail dust or other contaminants.
Dealers are paid to remove rail dust, but most don't do it. GM authorizes the use of a claybar or Oxalic acid, either will work, but a claybar, which takes longer, is safer.
I'm not a paint expert, but I do work with some, and every time I have had problems with paint, I have called on them, and never have they said to claybar for orange peel.
Important thing is if it is bad, have the dealer send it out for a professional buffing. Make sure they don't let the lube rack dude do it, or you will have bigger problems.