I inherited an internal tool from someone who left the company. They weren't a software developer. Everything had comments (not function comments/XML headers),

I inherited an internal tool from someone who left the company. They weren't a software developer. Everything had comments (not function comments/XML headers), behavior comments. Some were "someone who knows how to code should clean this up", "I want to do x but couldn't figure it out, this is close". It lacked clear abstractions, it was mostly one file. It wasn't even in a repository. The program was however purpose built for use by the developer, and people in a similar role at the company. The team who was supposed own it hated it, so I get to work on it :)