I also have started to lightly lubricate my hand gun cases to make sizing a lot easier. Since I tumble cases after sizing, no big deal, the lubricant gets cleaned off at that time. But a rag works too.
If I'm resizing just a few cases, I might not bother. A few is like 10 or so.
I've used isopropyl alcohol, 90% or greater, when mixing with lanolin because I had read denatured alcohol with lanolin does not work. But, since ReloaderFred recommends denatured alcohol, I'll have to give it a try.
90% or higher isopropyl alcohol is not the easiest to find.