I tumble my cases prior to sizing. I don't worry about cleaning lube off later since I use Lee collet neck diesand don't have to lube in the first place. Presently I'm using Walnut media with Flitz polish added. I tumble2 or3 hours and like bronko I leave the tumbler on as I'm taking cases out so I can hold them against the rim of the tumber to dislodge the media from the case. However, you always need to check the flash hole as there will just about always be a few cases with media stuck there.