all my data remains visible after deleting account details in prefs and un/reinstalling

Hi, I have temporarily worked with a computer and would like to remove all my zotero libraries now that someone else will use it. I have deleted my account name in the preferences, have disabled zotero, have uninstalled it and have cleared browser cache as well as data. But when opening zotero, my libraries are still visible there. Privacy issue! What can I do?

Thx.

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