Same here, I've used alcohol since day 1 on the first gen. iPhone with no issues or coating loss whatsoever.
I know people earlier in the thread balked at the idea but studies have shown time and time again that modern touch-screen phones are dirtier than you think and carry crazy amounts of bacteria (18x the amount of bacteria on a toilet handle!). This isn't just some OCD obsession here. You're in denial if you think your cell phone isn't a proverbial walking petri dish of germs and bacteria - yes, even if only YOU use the phone. A microfiber cloth or rub against clothing does nothing germ/bacteria wise, all it does is get rid of the finger smudges.
I try to clean (yes, with rubbing alcohol) my iPhone once a week or two.
This. I am not cleaning just the glass, I am just rubbing down the front screen protector.
Didn't think this was that far out of a question. Esp with how many people are obsessed with cases, screen protectors, and the like