That car is sure making some fine progress! I don't know if you have ever used a reloading case tumbler (rock tumbler) for cleaning the small stuff like those bolts but I picked up a cheap one off E-bay a few years back and use it when I have a handful of small stuff like bolts to clean. Walnut shell media takes a while but the screws and bolts come out looking like they are brand new. Something to consider.....