Disassociate an Apple ID from a computer

There's a work computer (iMac) I'll soon stop using, which might be used by other people in the future.

While I've mainly used a separate work-only Apple ID on the computer, I suspect I may have used my personal Apple ID on the computer from time to time.

I want to make sure that my personal Apple ID isn't used in the future on the work computer. How do I ensure this is the case?