Erase leftovers after windows recovery

Hello,

I want to make my 1 years old laptop to be as just got out of the box.

There is no built-in partition to restore it so I use the Windows 11 restore tool without saving my files and use the deep recovery.

Right now the laptop is in the initial windows 11 setup which is good. How do I make sure there is no leftovers files and folders that should be erase manually? I'll do it with 3rd party software to browse the hard drive because I dont want to complete the initial setup.