Here is the Fulton 5252 block plane fully disassembled after a very light clean with a nylon brush, a bit of oil to break the mechanisms loose, and some work on the iron with whetstone, emory cloth, and a fair amount of oil. I'm starting with this one because it's simpler and probably going to be more useful to me around the house day-to-day.
The iron has some significant pitting, but luckily not in any critical areas (I already ground the bevel to a clean surface). I want to get the flat side to a polished surface, so most or all of the pitting there will be ground off, but the bevel side can remain more or less as it is now after I finish taking the rust off.
The green paint is less obvious in-person than it appears under flash photography, but it's clear from the fact it is on the cheeks that it was a midlife addition to the plane. It needs to come off all the exterior parts of the sole so I can be sure all the wood-contact surfaces are as smooth as possible. I think I'll keep any remaining paint inside the body and on the lever cap. It feels like part of this plane's individual history.