Bad Griffin
I have the same problem with my Black iPhone5, I also use the Griffin Reveal Case. I have little white aluminium dots all over the back. I clean my phone regularly, it is very disappointing.
The Griffin even damaged the black strips in the top and the bottom at the back of my iPhone5. I cant rub the dots off.
My iPhone4 is still in mint condition with the CAPDASE case, never caused this problem.
I wish Apple would allow us to swap out our Black iPhone5 for the white iPhone5, or for an iPhone5 that wont do this.
I have been using the iPhone since the 1st generation iPhone, and I never had this problem before.
I hope Apple learns their lesson and does not make the same mistake again.
I think I am going to change to CAPDASE before the Griffin messes up the phone any further.