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Nope. The cleaner is formulated for optical grade glass. The iphone screen is just glass. You won't hurt it. I use it all the time. I am not sure about the new screen coating on the new phones, my guess is, it won't hurt it. Maybe someone with a 3GS will chime in and tell you for certain.
 
"Don't use window cleaners, household cleaners, aerosol sprays, solvents, alcohol, ammonia, or abrasives to clean iPhone."

"Unplug all cables and turn off iPhone (press and hold the Sleep/Wake button and slide the onscreen red slider). Then use the included cleaning cloth or a soft, slightly damp, lint-free cloth. Avoid getting moisture in openings."

At least that's what it says on the website.
 
Because of the coating on the 3GS, I'd recommend against any cleaning agent as it may impact the coating negatively. I also believe apple states that one should only use a damp lint free cloth with the 3GS.
 
y didnt the 3gs iphones come with a cleaning cloth this time??... well at least mine didnt.. did anyone elses come with a cleaning cloth?
 
y didnt the 3gs iphones come with a cleaning cloth this time??... well at least mine didnt.. did anyone elses come with a cleaning cloth?

I think it's because of the oleophobic coating on the iPhone 3GS screens. I guess Apple figured that the coating was enough and you wouldn't need vigorous scrubbing with some other cloth in order to remove fingerprints and smudges.

I think it's also because they didn't want to oleophobic coating to rub away with the cloth.
 
"Don't use window cleaners, household cleaners, aerosol sprays, solvents, alcohol, ammonia, or abrasives to clean iPhone."

"Unplug all cables and turn off iPhone (press and hold the Sleep/Wake button and slide the onscreen red slider). Then use the included cleaning cloth or a soft, slightly damp, lint-free cloth. Avoid getting moisture in openings."

At least that's what it says on the website.

This is the same information that says to use the "included cleaning cloth" when there is no such cloth.

I've been using Windex on my iPhone for two years and it works fine. The warning is there because liquid can trip the moisture sensors and void your warranty. You don't need to use very much glass cleaner. Just spray it on the cloth instead of directly on the iPhone and you'll be fine. I use it to clean the entire surface of the phone and it makes it look brand new. You really don't need to use glass cleaner very often on them though - especially with the 3GS.
 
This is the same information that says to use the "included cleaning cloth" when there is no such cloth.

I've been using Windex on my iPhone for two years and it works fine. The warning is there because liquid can trip the moisture sensors and void your warranty. You don't need to use very much glass cleaner. Just spray it on the cloth instead of directly on the iPhone and you'll be fine. I use it to clean the entire surface of the phone and it makes it look brand new. You really don't need to use glass cleaner very often on them though - especially with the 3GS.

True, the moisture might potentially set off the water sensors, but you'd have to be pretty negligent.

As for the 3GS, the oleophobic coating is what makes it easier to clean.
 
The following is taken from the iPhone 3GS Important Product Information Guide that came with the phone.
Page 9.
"Keeping the Outside of the iPhone Clean To clean iPhone, unplug all cables and turn off iPhone (press and hold the Sleep/Wake button, and then slide the onscreen slider). Then use a soft, slightly damp, lint-free cloth. Avoid getting moisture in openings. Don't use window cleaners, household cleaners, aerosol sprays, solvents, alcohol, ammonia, or abrasives to clean iPhone. If your iPhone has an oleophobic coating on the screen, simply wipe iPhone's screen with a soft, lint-free cloth to remove oil left by your hands and face. Please note that the ability of this coating to repel oil will diminish over time with normal usage, and that rubbing the screen with an abrasive material will further diminish its effect and may scratch your screen."

There was no cleaning cloth in my case.
 
y didnt the 3gs iphones come with a cleaning cloth this time??... well at least mine didnt.. did anyone elses come with a cleaning cloth?

Mine didn't come with a cloth.

I use eye glass cleaner on mine with the microfiber cloth that came with my MBP.
 
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