In this video he compares the rust removing results of white distilled vinegar and Evapo-Rust. Evapo-Rust is a leading commercial rust remover. He uses them on an old Stanley hand plane and an axe head. That allows you to see what they do on flat surfaces and in corners. The Evapo-Rust works a little better. However the white distilled vinegar is probably more environmentally friendly. It is worth noting that Evapo-Rust is acid-free. Some people do a bath of vinegar and then follow it up with a bath of Evapo-Rust. It makes the Evapo-Rust last longer and then it works out cheaper.