ThemeShaper
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Dust-Me Selectors is a Firefox extension that finds unused CSS selectors by inspecting your stylesheet and comparing the rules with the elements in your markup.
A must-have for your webcraft toolbelt.
PageSpeed provides similar details. It will also give you details on inefficient CSS selectors that you are using.
Thanks for the info Joseph, I didn’t know that about Page Speed.
I tend to use Unused-CSS. I find this service easier to use. You can customize and download the clean CSS file.
ThemeShaper 
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PageSpeed provides similar details. It will also give you details on inefficient CSS selectors that you are using.
Thanks for the info Joseph, I didn’t know that about Page Speed.
I tend to use Unused-CSS. I find this service easier to use. You can customize and download the clean CSS file.