I recently started on a project, in WP though, but I strongly believe the dev is an imbecile. He's no longer with us (thank god)

Doesn't remove old code, just comments it out, or leave the file there. He loved to use and rewrite plugins, so you can't update them.

I removed this one particular plugin, which seemed to hold the website together, because when I removed it, all the suppressed errors suddenly popped up.
I've used 3 days to clean up the code

Did I say that there's a .scss file for the site, but it's written as normal css and the output .css file has also been changed, so I can't clean the scss file and compile it, because that fucks up the css file =}