Purge all data from prop when it becomes reused

I would like to ability to purge all of the values from a prop when I want to repurpose it. For example, if I capture time of day in prop1, but later decide that prop1should be current url,  It would be nice if all data that prop has captured could be purged so there are no problems when viewing that prop overtime. I understand that this could be vary powerful so it should be something that I would have to call client care to do.