CSS Cleanup - remove non used css

Hi, we are playing around using this page (and the others in the list on the left side). http://www.google.com/support/+/bin/[login to view URL] The css file for these pages is reasonably large and contains lots of css that is not used on the pages we want. We want you to clean the css so just the relevant css is left. Please have a look at the [login to view URL] file. Currently it is 141KB, but over 90% is not used, so should become very small. As the css file is reasonably large I think you will need some software/application etc to help you clean it. Also doing it purely manually likely to leave mistakes. Please only people with css experience and have cleaned css before please bid. Thank you.