It seems that Zotero 'remembers' all entries I ever made in a field, and suggests them at later stages as auto-complete. Over time, this leads to the auto-suggest function becoming almost useless, because the suggestions it gives are becoming cluttered with typos and the like.

I would very much appreciate a button "clean database" or the like, which would remove those Authors / Journals / Journal abbreviations / ... from the auto-suggest lists which currently do not belong to any item in the database.