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Tableau Server has a Revert All button on the toolbar which returns the dashboard to the state it was on opening. http://kb.tableausoftware.com/articles/knowledgebase/controlling-toolbar-embedded-views
There is currently no "Clear All Filters" option within Tableau. In the Tableau Server version, you have the option Andrew mentions regarding a Revert All button which resets all filters to how the dashboard within the workbook was saved to the server. Some of the gurus here may have something up their sleeves with some serious coding, but out of the box there is no ability to do this.