On sizing dies, I do some combo of what everyone above posted. Unless I'm having trouble with them, I usually just screw the corner of a rag up into the sizing die, then follow up with a little oil. I'll wipe off the rod and expander ball. On straightline seating dies, I often take them apart to wipe off the crud and give the moving parts a drop of oil. I always clean new dies to remove any polish or metal chips left over from the manufacturing process. Lightman