Game Save File Deleted But After Creating New Game, Some Data Is Still Presenting

I kind of bypassed it by doing this cavemen technique. It deleted any hidden remnant, and then I disconnected the blueprints to export. And it now works, so the problem is gone. However, the way in which I solved it is not the proper one. There was definitely something hidden that could not be erased by deleting the files in the folder. And I had to create this pseudo code to solve it. Maybe I don’t know the engin fully, and I’m mistaken, but shouldn’t there be any built in tool within the editor for this? Just asking in case I don’t know.