Unfortunately we cannot polish that inner lens because of how thin it is. Most of the lens aren't recoverable because of the melted plastic caused by high wattage bulbs. If you're going to pry open your headlight instead of replacing it as a whole then it's worth the extra effort to mod it. Just make sure it follows your state laws when the modification is done.
The mod will shave off years to your car and you'll have brighter headlights now. Here's the most recent thread regarding a headlight modification. The most popular is Fred's projectors around here.
http://986forum.com/forums/boxster-general-discussions/78207-notes-about-headlight-retrofit.html