Like many of you here, I ordered the Otterbox Defender for my iPhone 3GS. Although the case is beautiful and rugged, I just couldn't put up with the built-in, flimsy screen protector. Moreover, I encountered the "oil slick" problem. I researched some solutions to the problem, but I wasn't thrilled with putting baby powder or cellophane on my phone. So to remedy the only flaw with the Defender, I did the following:
Here's a picture of the built-in defender case cut off with the Defender and Power Support screen protector packaging in the background:
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Now my iPhone looks, feels, and functions seamlessly. Hope this helps!
- Remove entire plastic screen cover from Defender case
- Cut off the screen protector part from the earpiece/light sensor part
- Reattach to the case only the earpiece/light sensor part
- Apply any screen protector directly to the iPhone
- Put iPhone inside Defender case
Here's a picture of the built-in defender case cut off with the Defender and Power Support screen protector packaging in the background:

Now my iPhone looks, feels, and functions seamlessly. Hope this helps!