MWhy,
Sorry to hear about your trouble. I had god awful etching all over my car this spring too. Tried everything without success. I started to freak out!
Researched and got some good
Info / advice from detailed image.
If you have a PC, I tried out Meg's DA microfiber correction system with great results. Very easy two step process and pretty inexpensive. Totally doable
even for an amateur DIY'er.
Here's my post from a couple months ago.
http://www.e90post.com/forums/showthread.php?t=669454
Good luck!