https://krisp.ai uses machine learning to remove background noise. I've used them with Zoom calls and it works really well. I think they don't currently have an "upload audio" feature for existing recordings, but it would be awesome if they offered this in the future.

Sorry it's not something you can use now, but I just thought I would mention it! I also did a quick Google search but unfortunately I couldn't find any AI noise removal tools that might solve this problem.