How can I effectively clean up styles in a large web site?

Question

Our web site has been under a constant development for a better part of the last five years. As it happens, pretty much all the styles for the site are in one big CSS file.

Answer 1

I see there's not a good answer yet. I have tried the "Unused CSS online tool" and seems to work ok for public sites. The problem is if you have a CSS to show your public website + an intranet (for example: wordpress site + login for registered users). The intranet pages woun't be tracked and you will lose your css styles.

My next try will be using gulp + uncss: https://github.com/ben-eb/gulp-uncss

You have to define all the urls of your site (external and internal) and (maybe; not sure) if you are running the site with user + password on your browser, gulp+uncss can go inside the internal url's.

Update: I see unused-css online tool has a login solution!