I have a 9/16" threaded shaft which screws into a socket. The threaded shaft seems to be plated with chrome or nickel. The socket seems to be a stainless or aluminum alloy of some sort. The threaded shaft has "set" in the socket, and doesn't want to unscrew. As of yet, I don't want to force it, as I think something would get damaged.
What is the best product to spray onto the joint area and let sit repeatedly to help loosen the "set" that's been taken?