I clean before sizing, this is normally a short trip thru the polisher with older media to remove dust dirt from the range and firing residues. cases ae then rolled in a damp towel to remove dust from media. I then Lube and size then polish both to brighten cases and remove lube. A lot of my shooting has been black powder cartridges the cases are wet when I get home, a few rinses deprime and polish. clean inside with a nylon brush and prime