For those who have both agricultural use farm tractors and lesser use limited use tractors, I see nothing wrong with keeping the light use one relatively clean and nice looking. I do it myself and the extra credit I put into it doesn't take long and often yields big price premiums at sale time. I have people in line to buy when I sell equipment and can get 50% to 75% more than uncared for equipment. I get more for ag-used equipment too but that doesn't get as nice of care.
I will cleaner-wax a tractor sheet metal to start with and then try to use spray detailer on it every couple of years. Nothing fancy but just keep the metal looking nice. In between I pressure pressure wash the outside once a year at low--1000(?) psi but nothing serious and I leave the engine dirty or maybe just a light pass.
For implements I pressure wash once a year before storage and then spray with a mix of new synthetic oil and diesel fuel, maybe 25%-75%. The metal look shiny and like new and no rust on ground-engaging tools. My 15 year old Brillion seeder looks shiny and from 10 feet away a fast glance would look like it was new or a clean demo. When I trade or sell almost anything, my accountant says I'm the only guy he knows that gets more than he paid for equipment.
So I'm compulsive about this in a limited way only because I grew up pretty poor and have worked hard to get what I have. I'm proud of it and am probably paid handsomely per hour in extra $$ at sale time for not much extra effort.
I'm much the same with my tractors.
When I buy a new one, I hand wax it before taking it afield. Being in the ag service business, and do lots of shredding on pastures with brush, and especially having to cut around oaks and mesquite trees, the wax helps keep the brush scratches off the paint.
I wash them when they get dirty. I blow them and my batwing cutters off, and fill up with diesel at the end of each day.
I grease daily in the morning before I start. Also keep the interiors clean and as dirt free as practical.
A bit of effort, kind of like taking good care of my livestock... But when it comes time to sell or trade, my stuff brings top dollar.
Just pulled out my big deck over trailer and knocked the dust off of it because I really don't have much use for it, and someone else probably does, so I'm going to sell it. Touched up where rust was bleeding through the paint, greased all the fittings and got it ready to sell.
Bet it brings decent money for a nearly 10 year old trailer. Especially with the prices of new ones like it bring today.