Optimize, minify and add vendor prefixes for your CSS
See the examples to try and learn how to use it
css_cleaner is a tool included with css_optmizer whose objective is remove unused CSS selectors.
The difference between this and other unused selectors removal tools is that css_cleaner analizes ALL project files (templates, source code, javascript, etc.), extracting all names found on them, and removing from the CSS the names not found. It's like using a bazooka to kill a fly, but it really works :D