I bet you would look pretty prune-y if you took a bath in vinegar… But that’s what this Stanley No. 5 plane is doing. I received this plane as a gift from my father. It’s in rough shape with a lot of surface rust. The first place to start is pull the plane apart and soak it for at least 24 hours in white vinegar. All the screws came out pretty easily except one in the frog. I had to use some PB Blaster (squirt and let it soak in for 5-10 minutes) to get the screw to turn.
You can see in the last photo (12 hours in the soak) that pieces of rust are already starting to come off the metal.