What it needs is... Rated 5 out of 5 stars

It NEEDS a tool to ACTUALLY clean the styles out.

So we wrote one and included here:
http://jclaim.sourceforge.net

Start it, then go to menu:
General/Handy Tools/Clean CSS

Feed it the file from this plug-in and your css file and it will show you a clean css file.

Enjoy! (It's free).

This review is for a previous version of the add-on (2.11).