The Style manager in the Designer gives you a complete overview of all the styles in your project (that and complete control of time through frontups). When using the Style manager, there are three important things to remember:
1. Styles include both classes and HTML tags
2. You can clean unused styles in two clicks (three clicks, if you're not in your Style manager)
3. You can't clean used styles (until you identify where they are and delete all instances of those styles)
Learn more about the Style manager.