Pick up a gallon of Evap-O-Rust. Should be able to find it just about anywhere you’d expect a somewhat wide variety of paint.
Clean them of oil and grease, drop them in it, wait 24 hours.
Seriously the easiest way I’ve ever found to remove rust. Easier than any sort of sanding, easier than electrolysis. About as hard as falling out of a boat.
I love the stuff.
So long as the fluid is that yellow color, you can re-use it. I keep a clear gallon bottle for the stuff I’ve used before so I can gauge when I need to replace it