Aside from clearing my desktop and browser history, what should I do to my computer before leaving my job?

I've been at my job for 5 years. Should I try to delete all my emails (we use Outlook) or do anything else specific before handing in my computer?

I'm careful not to use my computer for anything very personal, but I take it home with me at night so I've used it for general Google searching, reddit browsing, facebook, etc. Never anything NSFW, but a fair bit of shit-talking between me and some of my colleagues about other colleagues to be found in my Outlook and Skype for business histories.

Thoughts or general tips for privacy concerns when leaving?

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