Well, I went with a thorough soak with S100 aerosol, followed by a heavy rinse, then warm soapy water and clean rags. Worked great, and my bike does look really clean! I dried it with compressed air then went for a short ride and we are back in business. Oh, I removed the oil cooler first and I'm going back to the drawing board with that. Next oil change I'll have a better solution ready.