From what you've said, it sounds like you're looking for a way to reset all Slicers in the workbook at the same time, rather than resetting each of them individually.
If they are all attached to the same table of data, you can do this by clicking on that table and then clicking: Data > Sort & Filter > Clear
This might not sound very user friendly, but you could make this more easily accessible to your users by adding it to their Quick Access Toolbar or customizing their Ribbon.
You can learn how to add commands to the Quick Access Toolbar in the video lesson: Essential Skills Lesson 1-14 Customize the Quick Access Toolbar and preview the printout.
You can see a walkthrough of customizing the Ribbon in the video lesson: Expert Skills Lesson 9-20 Create a custom Ribbon tab.
An introduction to Slicers can also be found in the video lesson: Expert Skills Lesson 5-8 Filter a pivot table visually using slicers.
If your Slicers aren't all attached to the same table, I think a macro will be the only solution.
You can find that video lesson that explains recording macros in: Expert Skills Lesson 9-11 Record a macro with absolute references.
...and you can see how to assign a macro to a button on the workbook in: Expert Skills Lesson 9-16 Use shapes to run macros.
We don't attempt to teach PowerPivot in this course, since it is an add-in for Excel rather than part of the base product.
Howerver, Excel 2013 has merged some of the features of PowerPivot into the base product, and these are covered in depth in Expert Skills Session 6: The Data Model, OLAP, MDX and BI.
You'll also find a brief explanation of PowerPivot at the start of this session.
Jonathan is part of the professional team who answer Excel-related questions posted on the ExcelCentral.com forums.
Jonathan also tests our courses prior to publication and has worked on all of our ten world bestselling Excel books for Excel 2007, Excel 2010, Excel 2013, Excel 2016 for Windows and Excel 2016 for Apple Mac. Jonathan has also worked on over 850 video lessons for or video courses covering Excel 2007, Excel 2010 and Excel 2013.
As well as extensive Excel knowledge, Jonathan has worked in the IT world for over thirteen years as a programmer, database designer and analyst for some of the world's largest companies.