I know that road salt can be an issue over your way (I bought a really cheap car waaayy back in the late 70's while I was working over there for a while; it was cheap cos it'd seen a lot of salted road miles, but it only hadta last until I left.... and it didn't! :sour: ) but have you ever tried Lanotec or Lanolin?? :dontknow:
In a former life, I used to do
LOTS of beach, salty, & 'highly corrosive sand' miles (literally millions of them!

) and (besides the afore-mentioned)
none of the vehicles I used ever rusted out or even showed signs of rust, cos I used (repeatedly) Lanotec/Lanolin as an underbody/in-body/almost all over vehicle part sealer!! :clap: I'd meticulously clean the underbody first, even pressure sprayed
INSIDE the chassis rails (one of the
very few places I'll use a pressure sprayer on any vehicle!

), and make absobloodylutely sure there was
NOWHERE that salt, sand, or mud could hide.... then
liberally spray
Heavy Duty Lanolin around the underside of the vehicle; inside the chassis rails & in any little nooks & crannies that could trap sand or mud or other stuff; in the engine bay; on any moving parts that were exposed; and I'd repeat this often (usually after cleaning any salt/corrosive mud or sand etc off after every longish trip - so maybe more often, but
at least every 10,000 miles or so?!

) and after that early experience, didn't matter where in the world I'd been driving, I
NEVER had another vehicle with any rust issues! Still don't!!

hyea:
Me old mate Roothy has been using it probably longer'n anyone I know, and he swears by the stuff! (No affiliation with this product &/or Roothy, apart from some years of friendship as we each went our ways!) Check it out via the link below - easy enough to apply; even easier to re-apply; and cheap enough that you can be pretty liberal with it & repeat applications as & when you feel like it, or even more often if you are that concerned/that way inclined! :2thumbs:
https://roothy.com.au/product/lanol...MInbvLrYrM7QIVOoJLBR2Ozw3_EAAYASABEgIzDPD_BwE
So even if you don't intend ryding on salty roads unless it's unavoidable, this stuff might make you
juuust a little more ccomfortable about the occasional foray out there when the roads might be salted! :thumbup:
Ps: it also arguably makes your vehicles a little easier to clean, too!

Not sure I'd
completely agree with that, but
underneath any vehicle, it'll certainly make it easier to get the nasty stuff off!

hyea: