missplaced goodie on removing unused css classes

I seem to remember I saw some way to remove unused css classes effectively, but I seem to have missplaced it.
Anyone seen such a thing and can link me back to it?

Found some useful references I haven’t tried yet:

Dust-Me Selectors Firefox add-on
CSS Redundancy Checker
and this link
probably. Can’t open it right now because the dumbass technical department at work are harassing the programmers blocking half the internet or so, and they call it security :rolleyes: