I must use ARO different than some folks. Especially when storing an engine I fill it up good and it winds up everywhere. I put a few drops on the carb barrel as well and I think that is what caused a needle o-ring to swell up on me. Sometimes when I get home from flying I'll prop the plane up so the engine jug is facing straight down and let sit that way for a couple of weeks or more. The ARO will eventually work it's way past the cam area and up into the rocker boxes.
Anyone ever go back and read all of William Robisons's notes? I did that the other day and I'm always amazed at his way of getting the point across so simply. He was actually a very good writer considering his main career was mechanics. I think it mentioned he did teach at one time though.