update
for those of you that care:
Hello!
Honestly, we have not tested on the iPhone/iTouch only because the surface is glass. However, we have received reviews that it does work on the metal plate. Unfortunately, we cannot stand behind that at this time, but are going to research further.
The first step, our polish, has a mild abrasive that may permanently scratch the screen of your iPhone.
Applesauce is intended for and proven to work well on shiny, hard, plastic surfaces (similiar to the iPod).
We do offer the InvisibleSHIELD to protect from future scratches, so please check out our website if you are interested.
Thank you for your interest in Applesauce!
AnneMarie Hernandez
Customer Support
Applesauce, Inc.
http://www.applesaucepolish.com