MEDIA RESOURCES
Dust-Me Selectors - A Useful Tool for Finding Unused CSS
This tool is a Firefox add-on that allows you to spider your website and find selectors in your CSS that have not been used. In other words,
you can have a little Spring clean of your CSS file.
It will still involve some manual work to remove the unwanted CSS, but it is great for finding things that you may have added and then forgotten to remove at a later date.
Conclusion
There are many great tools out there, these are just two that I use most often.
Please let me know what tools you use, share the wealth in the comments!