“Everyone has some rusty items in their garage or workshop. In some cases its tools that have been exposed to damp conditions or in some cases its a car in thousands of pieces (many of which are rusty) as it undergoes a full restoration”.
Not tried it out yet but it sounds pretty easy with some easy to get materials. Continue reading at …. http://www.classiccarhub.co.uk/articles/rust-removal-electrolysis-classic-car-parts-cleaning.html
Another method i have tried out with success is simply using citric acid. See …….. https://mgbtips.wordpress.com/2020/04/20/removing-rust-with-citric-acid-5-steps-with-pictures/