I use a lube pad and roll the cases through a minimal amount of lube.
This is about the easiest method.
Any good commercial case lube will work well. I usually thin them down a bit, with rubbing alcohol or a bit of varsol. Then wipe them off, after sizing.
If you don't want to put out $25 for a commercially made pad, just tack a piece of folded, absorbent cloth to a board and apply the lube to the cloth. Cover it with Saran Wrap when you're finished so it won't dry out or get covered with grit.