Modded Starfield Cleanup

Find where your Starfield is installed (xxx\steamapps\common\Starfield) and delete the entire Starfield folder
Go to Documents\My Games\Starfield and delete the Data folder
Now please uninstall Starfield through Steam to be sure
Reinstall Starfield through Steam

If you can’t find where the main Starfield folder is for some reason, right click Starfield on Steam and navigate to Installed Files. Then click Browse…