Rust Prevention Noob

Sorry if I'm beating a dead horse here. I've always lived in the West. Currently in Washington. Now, I've never had to really deal with salt n shit that the city puts on the roads. There is a shitload of salt on the roads because my city got scared last winter because of the infamous "Snowmageddon." My truck has lived it's entire life in the relatively salt free environments of California. Those of you that know classic old Toyotas know that they return to the earth quickly with salt. I've already spotted rust on my truck. What is the best way to stop the onslaught of shit so that my truck will last? I've seen threads on "Fluid Film," what is it?

 

FLUID FILM is a lanolin based product containing no solvents. It will not evaporate or dry from the surface. FLUID FILM will leave a wet, non-drying film, that will provide long term corrosion protection on all metals and superior lubrication for all moving parts.

 

I was just looking into this too and found this .pdf to have good physical explanations:
https://denrex.com/wp-content/uploads/2018/03/PROLAN-Brochure_A4_ENG.pdf