...should I tumble the cases clean, wipe them?
Since it is a wax and not a grease, Imperial will not contaminate anything. You can wipe it off, tumble it (what I normally do), or do nothing (as long as you can't see it on the cases).
I am resizing 1k .30 Carbine cases right now using Imperial. As the brass doesn't have primers in them, if I tumbled them, the primer holes would be filled with media, so I will wipe off the wax when it comes time to trim them with the Giraud.
Member: Orange Gunsite Family, NRA--Life, Varmint Hunters' Assn., ARTCA, American Legion, & South Cuyahoga Sportsmen's Assn.
Caveat Emptor: Cavery Grips from Clayton, NC. He is a ripoff