Cleaning gunk off the edge of the body

What are you using to clean the film that forms on the top edge of the body? It builds up from my forearm resting on the edge. I try to whipe the neck after each play but I often forget to hit the body as well.

My ED polish arrived yesterday and it did a great job of getting the smudges off, but the funk on the edge is pretty stubborn. It is an Axis w/the polyester finish.

Thanks!