Previous Studio versions had the option to Delete Auxiliary Files as an option from the File menu. Studio 16 and Avid Studio has the option in the Control Panel, it is called Delete Render Files. To access this option go to Setup > Control Panel, then select the Storage Locations section. The Delete Render Files button is located here.
Note: If you want to move the Auxiliary Files location, the option to do so is located in the same section.