You did the right thing getting the salt spray off
Congratulations to your new tractor !
Thanks! I'm excited. I've been a country type guy who's lived in town my whole life, feels good to have a few acres to myself and a tractor to take care of it with.

. I very much, at least intend for this to be the only one I ever buy unless I need an additional ever down the road... So I am a bit of a maintenance freak. Rust does not add longevity to mechanical things that you want to keep for decades...
I've owned airplanes for 10 years, I'm getting out of direct airplane ownership and going back to a club which is like a time share, but those years of airplane ownership made me absurdly anal with maintenance. I mean folks can call it overkill what I do sometimes, but I look at the airplanes I've owned, the newest one is the one I'm selling right now, it is a 1968, I've owned a 1950 and a 1947. None of them were janky from their age, maintained they simply don't wear out... and what does gets replaced. These things last for decades because we maintain them to an absurd level, the factories originally estimated their service life to be 17 years if I recall right.... So if we can do that with lightweight aluminum boasting air-cooled engines that we hope to get 2000hrs or so out of between overhauls, there is no reason the same can't be done with cast and diesels, and to an even greater degree really...
I intend to do the same style of maintenance with the Kubota. I bought it with 780hrs on it, the dealer did the 800hr service. From here on out it has a log book for maintenance just like the birds. Every oil change, every significant repair or preventative maintenance gets logged. If I end up keeping it in cold storage I will have a a block heater, battery warmer, battery tender, oil sump pad heater and hydro fluid pad heater... Once weather breaks the mower and blower will get a meticulous service and repainting where necessary to keep rust at bay. . or a wipe down of boiled linseed oil where repainting may be pointless. I already found one grease zirk missed at the 800 hour so I will be going through all that as well- I love maintaining things! lol.
Everything done with the idea of longevity, longevity, longevity... Even if I'm told it's absurd. My figure is there isn't one single secret, its 1000 little things added up usually...