uncss[0] works well for me. It removes the unused styles and then I run the css through a minifier to finish the job. The css filesize is greatly reduced. [0]

uncss[0] works well for me. It removes the unused styles and then I run the css through a minifier to finish the job. The css filesize is greatly reduced. [0] https://github.com/giakki/uncss https://github.com/giakki/uncss