This script you would run on your local computer using an the built in IDLE or Juypter Notebooks that comes installed with Pro.
You can copy and paste the code into the python window in pro, it will display all of the services in the terminal. I adjusted that script for my personal use to export to a .xlsx instead.
Honestly, Clean my Org is going to be the more non-programmer friendly option. Unfortunately, arcgis online does not have any built in tools that can accomplish what you are asking for (aside from the python api).