How to clear most recently logged username?

[Xer0]

Does anyone have an idea of how I can clear the saved login account from my history? Trying to .zip up my fully modified (highres textures etc) directory to store on remote storage for future "fresh installs" and I intend to upload to google drive as part of my backup attempts, which I may also use to give to friends/randos that want quick access without having to download/install .iso's. But I don't want them to have my username saved :x