Best way to prep and remove rust

I have this hinge I got from the junkyard could not get Mina off the old one due to stripped bolt Best way to practice and get a good finish. It’s a small part so rattle should be good enough

I have this hinge I got from the junkyard could not get Mina off the old one due to stripped bolt Best way to practice and get a good finish. It’s a small part so rattle should be good enough