I wouldn't touch it. Trying to clean up a bike wrong will make it worth less than just showing it as a barn find. For instance, you said the chrome was good, and just had crud on it. You're wrong. The chrome is rusty, and has crud on it. AMF's didn't have great chrome. So once the rust sets it in a blanket fashion such as on your handlebars, the chrome is pretty much destroyed. A 'barn find' won't misrepresent the bike's condition. Cleaning it up will take a LOT of work on your part, and you won't be happy with the results. Only a complete restoration will bring it back.