Clearing a slicer value

Thanks for that, however doing the 'reset' would just return the slicer to a prior value. Single select slicers cannot (I don't think) start in an unselected state. 

The issue I have is that the selected value is no longer valid for that page so I don't know why it persists.  In the below graphic, I picked a week when I didn't have relative filtering set up. Then I put a relative filter of prior 6 calendar weeks, then expanded the slicer. The moment I click off the Feb 22 entry, it drops off the list. 

I'm just trying to figure out how to no longer have it selected when the user goes back to the page without them having to do anything. If I could start out with nothing selected then the "reset to default" would work; however, it is a destructive operation. It clears all of the filters on all of the pages back to the default, and that is a bad practice as the user may want to have their report remain filtered to a specific department.