What are safe cleaners for the oleophobic screen?

I understand that Apple has said not to use solvents, ammonia, abrasives or basically anything other than water on the 3gs screen. I was wondering what a cleaner based on a very diluted glycolic acid might do to the screen. I have a screen cleaner like this, and before using it was wondering how easily the new screen damages. I have not yet found any thread that explains how sensitive the oleophobic coating is, nor one that explains the chemical reactions that might happen with the coating. Calling any chemists, or anyone that has experience with this sort of thing. Thanks in advance, any input would be appreciated.

According to the iPhone 3GS User Guide, page 45:
http://manuals.info.apple.com/enUS/iPhone_UserGuide.pdf
Ignore this information at your own peril. If you were going to use an acid-based cleaner, I'm not sure why you wouldn't just use a weak solution of vinegar. If you are going to destroy the screen, why spend a lot of money?

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