+1 for fluid film all the things. I also buy CRC 656 marine by the gallon put in one of those pump sprayers with the wand. Let's me easily reach under there after a wash and coat things real good between the fluid film. These are famous in the PWC world for keeping your engine bay rust free in saltwater. I have a 20-year-old PWC with no rust and my JK frame/axles were completely rust free after 12 years and 233K miles. There is nothing I despise more than rust.