Vinegar works fine, the only problem I have comes later. As Z pointed out you have to dry it immediately otherwise it will rust again. Sometimes I don't have the time to work on the parts after I removed the rust. Here Evaporust is great. Just dip it into (clean) Evaporust and let it air dry. It protects well for a couple of days (maybe weeks?).
1966 Convertible (Plant: San Jose, CA)
289 2V, PS, AC