Hi Gillian, There are two different plugins that do this, each with slightly different functionality. First, you can try the Character and Paragraph tools at http://www.siliconprairiesoftware.com/Downloads.html. These tools will scan every FM file in your and then delete any unused character and paragraph formats. I have used these tools with success. You would probably want to use this if you are only doing template maintenance.
Second, there is CleanImport at http://www.electropubs.com/ez_cleanimport3.html. This tool deletes all paragraph and character tag names, table definitions, cross-reference formats, conditional text tags, master pages, reference pages, and variable definitions from the current document, then allows you to import formats from a selected template. You would probably want to use this tool if you are completely redoing your template. -- Sincerely, Joseph Lorenzini