These things will make the outside of your car nice, but if you aren't treating the underside, it is still going to rust away on you. In NE Ohio, you need to wash your car almost twice a week, not every other week. You need to be putting something on the underside if your car like, Fluid Film, Bar Chain oil, engine oil, transmission fluid, mineral oil, vaseline, WD 40 .....anything to protect it from salt.
If you work on your own car and don't have a can of Fluid Film, etc ,etc to spray whatever wheel well you are working in, you are wasting a perfect opportunity for rust protection. Slather it on. There is a reason bone yards are FULL of transmissions and engines. Because the body always goes first because too many people don't have a clue.