There’s also purge. It’s a super-remove that will go through the database and delete every record the user ever existed. I use it sparingly, since the record of purging a user doesn’t even appear in the modlog (no instance admin would ever abuse this power, right?). Can’t log a purge because that user never existed. Even regular-level spam bots don’t get the purge treatment.

I can purge comments, also. I’ve even done it once for a mod. I forget the circumstances of how we reached that point, something about a ban not removing content properly? It was probably hate-related in some form.