Welcome to the club!
Electrolysis has been used to restore ancient metal artifacts, armory and weapons for museums and collections since electricity was discovered.
Very important not to devalue unique priceless pieces of art and treasures that have thousands of years of corrosion....
That endorsement did it for me, when I first heard about it in school, many moons ago.
I forgot all about it until I started to look around for simple derusting methods for my truck restoration on the internet.
...of course AFTER an afternoon of power brushing my old single manifolds I used to have.
- It sometimes takes a little frustration to appreciate what SIMPLE really means.
Vinegar, molasses, cola and citric acid also work well for small (or too large) parts, albeit slow.