Convert Excel CSV file to UTF-8 encoding (see picture)

I have files that I need to uploaded to a software. The files must be .csv and they need to be UTF-8 encoded. I am unable to successfully convert these files to be UTF-8 encoded. Looking at the files online as a .txt you can see the invisible string of characters that shouldn't be there. (see attached image) I need someone who is familiar with converting these files to be UTF-8 compatible.