Kerosene is the wonder worker for old machines that have gunked up from years of old oil and neglect. Don't be afraid to dunk the whole thing in. It won't take the decals off if the top coat is stable! Always a good idea to test a spot first and don't scrub on the pretty details. Billy's (LOSTN51) has a wonderful three part tutorial on cleaning and restoring old machines in the Vintage Machine section.
Welcome from Oregon.